OMB APPROVAL
                                                 OMB Number:       3235-0570
                                                 Expires:  August 31, 2013
                                                 Estimated average burden
                                                 hours per response.....18.9



                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM N-CSR

                   CERTIFIED SHAREHOLDER REPORT OF REGISTERED
                        MANAGEMENT INVESTMENT COMPANIES



		Investment Company Act file number 811-21321

                       Pioneer Municipal High Income Trust
               (Exact name of registrant as specified in charter)


                       60 State Street, Boston, MA 02109
              (Address of principal executive offices) (ZIP code)


            Terrence J. Cullen, Pioneer Investment Management, Inc.,
                       60 State Street, Boston, MA 02109
                    (Name and address of agent for service)


Registrant's telephone number, including area code:  (617) 742-7825


Date of fiscal year end:  April 30


Date of reporting period:  May 1, 2010 through April 30, 2011


Form N-CSR is to be used by management investment companies to file reports with
the Commission not later than 10 days after the transmission to stockholders of
any report that is required to be transmitted to stockholders under Rule 30e-1
under the Investment Company Act of 1940 (17 CFR 270.30e-1).  The Commission may
use the information provided on Form N-CSR in its regulatory, disclosure review,
inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-CSR,
and the Commission will make this information public. A registrant is not
required to respond to the collection of information contained in Form N-CSR
unless the Form displays a currently valid Office of Management and Budget
("OMB") control number. Please direct comments concerning the accuracy of the
information collection burden estimate and any suggestions for reducing the
burden to Secretary, Securities and Exchange Commission, 450 Fifth Street, NW,
Washington, DC 20549-0609.  The OMB has reviewed this collection of information
under the clearance requirements of 44 U.S.C. ss. 3507.


ITEM 1. REPORTS TO SHAREOWNERS.


Pioneer Municipal High
Income Trust


--------------------------------------------------------------------------------
Annual Report | April 30, 2011
--------------------------------------------------------------------------------

Ticker Symbol:    MHI



[LOGO] PIONEER
       Investments(R)






                        visit us: pioneerinvestments.com


Table of Contents



                                                         
Letter to Shareowners                                         2

Portfolio Management Discussion                               4

Portfolio Summary                                             9

Prices and Distributions                                     10

Performance Update                                           11

Schedule of Investments                                      12

Financial Statements                                         22

Financial Highlights                                         25

Notes to Financial Statements                                27

Report of Independent Registered Public Accounting Firm      35

Approval of Investment Advisory Agreement                    37

Trustees, Officers and Service Providers                     41



             Pioneer Municipal High Income Trust | Annual Report | 4/30/11     1


President's Letter

Dear Shareowner,

The U.S. economy is moving forward on a slow path to recovery. We believe the
theme for the economy in 2011 may be modest but positive growth. The private
sector is showing signs of slow but steady improvement, led by higher capital
investment, solid exports, improved consumption, and gradually rising demand
for consumer auto loans and commercial loans. At the same time, the risks to a
steady recovery remain substantial, including the continued delays in the
housing sector's recovery, rising oil prices, and the fiscal drag of U.S.
federal and state budget cuts. We are concerned about the long-term risk of
inflation in an environment of accommodative Fed policy, continued low nominal
and "real" interest rates and rising commodity prices.

The recovery process may occur more slowly than many would like, and will
almost certainly be accompanied by short-term market swings. But our investment
professionals are finding good opportunities to invest. Through the first
quarter of 2011, although bonds remained popular with investors, we believed
there was value in the equity market. In both equity and bond markets, we are
finding good opportunities to invest using the same disciplined approach we
have used at Pioneer since 1928, which is to focus on identifying undervalued
individual securities with the greatest potential for success, carefully
weighing risk against reward. Our teams of investment professionals continually
monitor and analyze the relative valuations of different sectors and securities
globally to help build portfolios that we believe can help you achieve your
investment goals.

At Pioneer, we have long advocated the benefits of staying diversified and
investing for the long term. The strategy has generally performed well for many
investors. For instance, bond markets certainly rewarded investors for most of
2010, even though equity valuations seemed quite reasonable and were
inexpensive relative to bonds and compared with historic levels -- conditions
which represented potentially good value for long-term investors.

Our advice, as always, is to work closely with a trusted financial advisor to
discuss your goals and work together to develop an investment strategy that
meets your individual needs. There is no single best strategy that works for
every investor.


2     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


We invite you to learn more about Pioneer and our time-tested approach to
investing by consulting with your financial advisor or visiting us online at
www.pioneerinvestments.com. We greatly appreciate your trust in us and we thank
you for investing with Pioneer.

Sincerely,

/s/ Daniel K. Kingsbury

Daniel K. Kingsbury
President and CEO
Pioneer Investment Management USA, Inc.

Any information in this shareowner report regarding market or economic trends
or the factors influencing the Trust's historical or future performance are
statements of the opinion of the Trust's management as of the date of this
report. These statements should not be relied upon for any other purposes. Past
performance is no guarantee of future results, and there is no guarantee that
market forecasts discussed will be realized.


             Pioneer Municipal High Income Trust | Annual Report | 4/30/11     3


Portfolio Management Discussion | 4/30/11

Municipal bonds produced modest positive returns over the 12 months ended April
30, 2011, although the overall results masked the dramatic changes in the
investment environment during the period. Municipals generated negative returns
during the first eight months of the period, but rebounded during the first
four months of 2011, through April 30, 2011, producing positive returns. In the
following interview, David Eurkus discusses the factors that influenced the
performance of Pioneer Municipal High Income Trust during the 12 months ended
April 30, 2011. Mr. Eurkus, senior vice president and portfolio manager, is a
member of Pioneer's fixed-income team, and is responsible for the daily
management of the Trust.

Q  How did Pioneer Municipal High Income Trust perform during the 12 months
   ended April 30, 2011?

A  Pioneer Municipal High Income Trust produced a total return of 1.42% at net
   asset value and 1.04% at market price over the 12 months ended April 30,
   2011, with common shares of the Trust selling at a 3.1% premium to net
   asset value at the end of the period. During the same 12-month period, the
   Trust's benchmarks, the Barclays Capital High Yield Municipal Bond Index
   and the Barclays Capital Municipal Bond Index, returned 3.34% and 2.20%,
   respectively. The Barclays Capital High Yield Municipal Bond Index is
   designed to track the performance of lower-rated municipal bonds, while the
   Barclays Capital Municipal Bond Index is designed to track the performance
   of investment-grade municipal bonds. Unlike the Trust, the two Barclays
   Capital indices are not leveraged. Also during the 12 months ended April
   30, 2011, the average return at market price of the 14 closed end funds
   (most of which employ leverage) in Lipper's High Yield Municipal Debt
   closed end fund category was -1.08%. At the end of the Trust's fiscal year
   on April 30, 2011, the 30-day SEC yield on the Trust's shares was 8.36%.

Q  What were the principal factors that affected the Trust's performance during
   the 12 months ended April 30, 2011?

A  After producing healthy returns for several months, municipal securities
   declined in the final quarter of 2010, when demand for municipal bond
   investments declined dramatically as a heavy issuance of new, tax-exempt
   municipal bonds entered the market. The inflow of new bonds began after it
   became clear that the U.S. government would not extend the Build America
   Bonds (BAB) program, which had authorized the issuance of taxable municipal
   securities subsidized by the U.S. Treasury. At the same time that supply
   increased, demand for municipals shrank dramatically as many investors fled
   the market.


4     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


   Other market conditions that changed during the final quarter of 2010
   included a general rise in interest rates as well as the perception among
   investors that the Federal Reserve System (the Fed) was not likely to
   sponsor a third round of quantitative easing, which had been designed to
   help stimulate the economy and had helped support the performance of
   municipal bonds. The election of many new Republican members of Congress in
   November reduced the likelihood that the government would raise taxes on
   personal income or authorize further stimulus spending, either to spur the
   economy or to assist state and local governments. In addition, well-
   publicized remarks by one analyst predicting $200 to $400 billion in
   defaults on municipal securities in 2011 helped drive many individual
   investors from the municipal bond market. All of those factors resulted in
   the municipal market performing poorly over the final few months of 2010.

   Municipals fared somewhat better during the first four months of 2011,
   however, with both high-yield municipals and investment-grade municipals
   generating positive results. As a result of the rally early in 2011, over
   the full 12-month reporting period ended April 30, 2011, both high-yield
   and investment-grade municipals ended up generating positive performance,
   with high-yielding bonds outperforming higher-quality securities. In that
   environment, the Trust underperformed both the Barclays Capital High Yield
   Municipal Bond Index and the Barclays Capital Municipal Bond Index. At the
   end of the period, on April 30, 2011, 64% of the Trust's total investment
   portfolio was invested in high-yield, below investment-grade debt, and 36%
   of the Trust's total investment portfolio was invested in higher-quality,
   investment-grade municipals.

Q  How did you position the Trust's portfolio and how did the positioning change
   over the course of the 12 months ended April 30, 2011?

A  We maintained a very consistent positioning during the 12-month period ended
   April 30, 2011, keeping the Trust's portfolio fully invested, well
   diversified and with an emphasis on credit-worthy assets. We focus on
   producing current income for shareholders through investments in securities
   that we believe -- as a result of our credit research -- are backed by
   issuers that have the ability to pay out consistent, reliable income. We
   invested the Trust almost exclusively in revenue bonds during the 12-month
   period. Revenue bonds rely on revenues from specific funding sources, such
   as hospital health care facilities or colleges/universities or water
   treatment plants, that produce their own fees and revenues. In contrast,
   general obligation bonds do not require a dedicated stream of tax revenues
   to cover that specific debt issuance and are more likely to experience
   downgrades in credit quality by various rating agencies due to the current
   financial problems facing many state and local governments. The two largest
   groups in the Trust's portfolio as of April 30, 2011, were bonds backed by
   hospitals/health care facilities, which represented 28.1% of the Trust's
   investment portfolio, and bonds


             Pioneer Municipal High Income Trust | Annual Report | 4/30/11     5


   backed by transportation facilities (including airports), representing
   12.4% of the Trust's investment portfolio.

Q  What types of investments most affected the Trust's performance during the 12
   months ended April 30, 2011?

A  The Trust's municipal bond holdings generally performed in line with
   expectations during the period. All sectors in which we invested the Trust
   produced positive results. One area that tended to detract from the Trust's
   performance results, however, were some investments in AAA-rated
   zero-coupon bonds in the transportation sector. Because zero-coupon bonds
   tend to decline in price more than regular coupon bonds when interest rates
   rise, the Trust's holdings in the zero-coupon bonds suffered greater price
   loss when market interest rates rose in the second half of the Trust's
   fiscal year.

Q  Could you describe how leverage is used in managing the Trust?

A  Leverage is used to increase the yield of the Trust. Leverage was obtained
   from the issuance of auction-rate preferred shares. The proceeds from the
   issuance were used to increase the amount of assets available to be
   invested in additional portfolio securities. As the cost of the
   auction-rate preferred shares is generally at a lower interest rate than
   the returns produced by investing in additional portfolio securities, a
   higher level of income is generated for the Trust's common shareowners.
   This results in an increased yield.

   Leverage may also have an impact on the common shareowners' total return
   (which is the combination of yield and the increase/decrease in the Trust's
   share price). As discussed above, leverage allows the Trust to invest in
   additional portfolio securities. By owning these additional securities at a
   time when the value of the underlying investments are rising, the total
   return of the Trust may be enhanced in the form of additional increases in
   the Trust's share price from holding the additional securities. However,
   when the values of the underlying portfolio securities are falling, the
   opposite may occur and total return may be reduced from the same effect.

Q  How did the levels of leverage used by the Trust change during the period?

A  At the end of the Trust's fiscal year, on April 30, 2011, 25.8% of the
   Trust's total managed assets were financed by leverage, compared with 24.7%
   of the Trust's total managed assets being financed by leverage at the start
   of the fiscal year on May 1, 2010.

   Bond prices increased and yields declined during the first six months of
   the Trust's fiscal year. During the second six months of the Trust's fiscal
   year, bond prices declined and yields rose.


6     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


Q  What is your investment outlook?

A  We believe that good investment opportunities still exist in the tax-exempt
   municipal market, where bonds are very attractively valued relative to the
   taxable market. The supply of municipal bonds is likely to be limited based
   on the extreme reduction in new issuance in the first quarter of 2011, as
   state and local governments across the nation have embarked on austerity
   programs. At the same time, yields in the municipal market remain very
   attractive. At the start of the Trust's new fiscal year, tax-exempt yields
   were higher than the yields offered by taxable bonds of comparable maturity
   and comparable quality. We believe that this positive trend should
   continue. The general economic backdrop also should support investments in
   municipal securities, as the combination of a recovering economy, continued
   low inflation, and the Fed's continued accommodative monetary policy should
   continue to support municipal bonds.


Please refer to the Schedule of Investments on pages 12-21 for a full listing
of Trust securities.

Investments in high-yield or lower-rated securities are subject to
greater-than-average risk. The Trust may invest in securities of issuers that
are in default or that are in bankruptcy.

A portion of income may be subject to state, federal, and/or alternative
minimum tax. Capital gains, if any, are subject to a capital gains tax. When
interest rates rise, the prices of debt securities held by the Trust will
generally fall. Conversely, when interest rates fall the prices of debt
securities held by the Trust generally will rise. By concentrating in municipal
securities, the Trust is more susceptible to adverse economic, political or
regulatory developments than is a portfolio that invests more broadly.
Investments in the Trust are subject to possible loss due to the financial
failure of the issuers of the underlying securities and the issuers' inability
to meet their debt obligations.

The Trust may invest up to 20% of its total assets in illiquid securities.
Illiquid securities may be difficult to dispose of at a fair price at the times
when the Trust believes it is desirable to do so, and their market price is
generally more volatile than that of more liquid securities. Illiquid
securities are also more difficult to value and investment of the Trust's
assets in illiquid securities may restrict the Trust's ability to take
advantage of market opportunities.

The Trust uses leverage through the issuance of preferred shares. Leverage
creates significant risks, including the risk that the Trust's incremental
income or capital appreciation will not be sufficient to cover the cost of
leverage, which may adversely affect the return for the holders of common
shares. Since February of 2008, regularly scheduled auctions for the Trust's
preferred shares have failed and preferred shareowners have not been able to
sell their shares at auction. The


             Pioneer Municipal High Income Trust | Annual Report | 4/30/11     7


Board of Trustees of the Trust has considered, and continues to consider, this
issue.

The Trust is required to maintain certain regulatory and rating agency asset
coverage requirements in connection with its outstanding preferred shares. In
order to maintain required asset coverage levels, the Trust may be required to
alter the composition of its investment portfolio or take other actions, such
as redeeming preferred shares with the proceeds from portfolio transactions, at
what might be inopportune times in the market. Such actions could reduce the
net earnings or returns to holders of the Trust's common shares over time.

Risks of investing in the Trust are discussed in greater detail in the Trust's
original offering prospectus and in shareowner reports issued from time to
time.

These risks may increase share price volatility.

Past performance is no guarantee of future results, and there is no guarantee
that market forecasts discussed will be realized.

Any information in this shareowner report regarding market or economic trends
or the factors influencing the Trust's historical or future performance are
statements of opinion as of the date of this report. These statements should
not be relied upon for any other purposes.


8     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


Portfolio Summary | 4/30/11

Portfolio Diversification
--------------------------------------------------------------------------------
(As a percentage of total investment portfolio)

[THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL]


                               
Health Revenue                   28.1%
Insured                          12.4%
Other Revenue                    11.8%
Tobacco Revenue                  11.6%
Airport Revenue                   9.8%
Development Revenue               8.2%
Education Revenue                 5.4%
Facilities Revenue                4.2%
Pollution Control Revenue         3.3%
Transportation Revenue            2.6%
Gaming Authority Revenue          1.7%
Airline Revenue                   0.7%
Housing Revenue                   0.2%
Utilities Revenue*                0.0%


* Amount is less than 0.1%

Portfolio Quality
--------------------------------------------------------------------------------
(As a percentage of total investment portfolio; based on S&P ratings)

[THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL]


                               
AAA                               9.4%
AA                                4.8%
A                                 6.2%
BBB                              16.0%
BB                                4.9%
B                                 8.0%
CCC                               2.7%
Not Rated                        48.0%


Bond ratings are ordered highest to lowest in portfolio. Based on Standard &
Poor's measures, AAA (highest possible rating) through BBB are considered
investment grade; BB or lower ratings are considered non-investment grade. Cash
equivalents and some bonds may not be rated.

The portfolio is actively managed and current holdings may be different.

10 Largest Holdings
--------------------------------------------------------------------------------
(As a percentage of long-term holdings)*


                                                                                            
 1.    Metropolitan Pier & Exposition Authority Dedicated State Tax Revenue, 0.0%, 6/15/22         3.4%
-------------------------------------------------------------------------------------------------------
 2.    New Jersey Economic Development Authority Revenue, 6.25%, 9/15/29                           3.2
-------------------------------------------------------------------------------------------------------
 3.    Connecticut Health & Educational Facilities Authority Revenue, RIB, 13.361%,
       7/1/42 (144A)                                                                               2.8
-------------------------------------------------------------------------------------------------------
 4.    North Texas Tollway Authority Revenue, 5.75%, 1/1/33                                        2.6
-------------------------------------------------------------------------------------------------------
 5.    Washington State General Obligation, 0.0%, 6/1/22                                           2.4
-------------------------------------------------------------------------------------------------------
 6.    Tobacco Settlement Financing Corp., 6.75%, 6/1/39                                           2.3
-------------------------------------------------------------------------------------------------------
 7.    New York State Dormitory Authority Revenue, RIB, 15.125%, 7/1/26 (144A)                     2.3
-------------------------------------------------------------------------------------------------------
 8.    Chicago O'Hare International Airport Special Facility Revenue Refunding Bonds,
       5.5%, 12/1/30                                                                               2.2
-------------------------------------------------------------------------------------------------------
 9.    Golden State Tobacco Securitization Corp., 7.875%, 6/1/42                                   2.1
-------------------------------------------------------------------------------------------------------
10.    Texas State, RIB, 14.194%, 4/1/30 (144A)                                                    2.0
-------------------------------------------------------------------------------------------------------


* This list excludes temporary cash investments. The portfolio is actively
  managed, and current holdings may be different. The holdings listed should
  not be considered recommendations to buy or sell any security listed.


             Pioneer Municipal High Income Trust | Annual Report | 4/30/11     9


Prices and Distributions | 4/30/11

Market Value per Common Share
--------------------------------------------------------------------------------



--------------------------------------------------------------------------------
                                        4/30/11                 4/30/10
--------------------------------------------------------------------------------
                                                          
                                        $ 13.40                 $ 14.34
--------------------------------------------------------------------------------
Premium                                    3.1%                     3.5%
--------------------------------------------------------------------------------


Net Asset Value per Common Share
--------------------------------------------------------------------------------



--------------------------------------------------------------------------------
                                        4/30/11                 4/30/10
--------------------------------------------------------------------------------
                                                          
                                        $ 13.00                 $ 13.86
--------------------------------------------------------------------------------


Distributions per Common Share: 5/1/10-4/30/11
--------------------------------------------------------------------------------



--------------------------------------------------------------------------------
                                  Net
                               Investment      Short-Term         Long-Term
                                 Income       Capital Gains     Capital Gains
--------------------------------------------------------------------------------
                                                           
                                $ 1.065           $ --              $ --
--------------------------------------------------------------------------------



10     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


Performance Update | 4/30/11

Investment Returns
--------------------------------------------------------------------------------
The mountain chart on the right shows the change in market value, including
reinvestment of dividends and distributions, of a $10,000 investment made in
common shares of Pioneer Municipal High Income Trust, compared to that of the
Barclays Capital Municipal Bond Index and Barclays Capital High Yield Municipal
Bond Index.


 Cumulative Total Returns
 (As of April 30, 2011)
--------------------------------------------------------------------------------
                            Net Asset         Market
 Period                     Value (NAV)       Price
--------------------------------------------------------------------------------
                                        
 Life-of-Trust
 (7/17/2003)                54.91%            52.54%
 5 Years                    21.07             43.01
 1 Year                      1.42              1.04
--------------------------------------------------------------------------------


[THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL]



Value of $10,000 Investment

                                    Barclays Capital         Barclays Capital
           Pioneer Municipal           High Yield               Municipal
           High Income Trust      Municipal Bond Index          Bond Index
           -----------------      --------------------          ----------
                                                         
7/03            10000                    10000                    10000
                10551                    10441                    10891
4/05            10651                    11153                    12262
                10666                    11394                    13177
4/07            12804                    12052                    14487
                12511                    12388                    13523
4/09            10153                    12773                    11127
                15097                    13904                    14194
4/11            15254                    14211                    14668


Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent
month-end performance results. Current performance may be lower or higher than
the performance data quoted.

Performance data shown represents past performance. Past performance is no
guarantee of future results. Investment return and market price will fluctuate,
and your shares may trade below NAV due to such factors as interest rate
changes and the perceived credit quality of borrowers.

Total investment return does not reflect broker sales charges or commissions.
All performance is for common shares of the Trust.

Closed-end funds, unlike open-end funds, are not continuously offered. There is
a one-time public offering and once issued, shares of closed-end funds are sold
in the open market through a stock exchange and frequently trade at prices
lower than their NAV. NAV is total assets less total liabilities which includes
preferred shares, divided by the number of common shares outstanding.

When NAV is lower than market price, dividends are assumed to be reinvested at
the greater of NAV or 95% of the market price. When NAV is higher, dividends
are assumed to be reinvested at prices obtained under the Trust's dividend
reinvestment plan.

The performance table and graph do not reflect the deduction of fees and taxes
that a shareowner would pay on Trust distributions or the sale of Trust shares.


The Barclays Capital Municipal Bond Index is a broad measure of the municipal
bond market. The Barclays Capital High Yield Municipal Bond Index totals over
$26 billion in market value and maintains over 1300 securities. Municipal bonds
in this index have the following requirements: maturities of one year or
greater, sub investment grade (below Baa or non-rated), fixed coupon rate,
issued after 12/31/90, deal size over $20 million, and maturity size of at
least $3 million. Index returns are calculated monthly, assume reinvestment of
dividends and, unlike Trust returns, do not reflect any fees, expenses or sales
charges. The indices are not leveraged. You cannot invest directly in the
indices.


            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     11


Schedule of Investments | 4/30/11



------------------------------------------------------------------------------------------------------
                   S&P/Moody's
Principal          Ratings
Amount             (unaudited)                                                           Value
------------------------------------------------------------------------------------------------------
                                                                               
                                 TAX EXEMPT OBLIGATIONS -- 129.1% of Net Assets
                                 Alabama -- 1.4%
  $   1,000,000           NR/NR  Huntsville-Redstone Village Special Care Facilities
                                 Financing Authority, 5.5%, 1/1/28                       $     780,340
      4,500,000           NR/NR  Huntsville-Redstone Village Special Care Facilities
                                 Financing Authority, 5.5%, 1/1/43                           3,141,495
                                                                                         -------------
                                                                                         $   3,921,835
------------------------------------------------------------------------------------------------------
                                 Arizona -- 2.5%
      5,000,000       BBB-/Baa3  Apache County Industrial Development Authority,
                                 5.85%, 3/1/28                                           $   4,902,550
        994,000         NR/Baa3  Pima County Industrial Development Authority,
                                 6.75%, 7/1/31                                                 898,397
        960,000         NR/Baa3  Pima County Industrial Development Authority,
                                 7.25%, 7/1/31                                                 918,326
        500,000         NR/Baa2  Yavapai County Industrial Development Authority,
                                 6.0%, 8/1/33                                                  482,700
                                                                                         -------------
                                                                                         $   7,201,973
------------------------------------------------------------------------------------------------------
                                 California -- 9.0%
      3,000,000           NR/A1  ABAG Finance Authority for Nonprofit Corp. Revenue
                                 Bonds, 5.75%, 7/1/37                                    $   2,889,840
      7,885,000(a)       AA+/WR  California State University Revenue, RIB, 12.492%,
                                 11/1/39 (144A)                                              6,281,743
        602,381(b)        NR/NR  California Statewide Communities Development
                                 Authority Environmental Facilities Revenue,
                                 9.0%, 12/1/38                                                  33,854
      3,000,000          BB+/NR  California Statewide Communities Development
                                 Authority Revenue, 7.25%, 10/1/38                           2,994,420
      5,150,000+        AAA/Aaa  Golden State Tobacco Securitization Corp.,
                                 7.8%, 6/1/42                                                5,889,540
      7,000,000+        AAA/Aaa  Golden State Tobacco Securitization Corp.,
                                 7.875%, 6/1/42                                              8,015,630
                                                                                         -------------
                                                                                         $  26,105,027
------------------------------------------------------------------------------------------------------
                                 Colorado -- 0.3%
      1,000,000           NR/NR  Kremmling Memorial Hospital District Project,
                                 7.125%, 12/1/45                                         $     918,940
------------------------------------------------------------------------------------------------------
                                 Connecticut -- 5.4%
     10,335,000(a)       NR/Aaa  Connecticut Health & Educational Facilities Authority
                                 Revenue, RIB, 13.361%, 7/1/42 (144A)                    $  10,855,264
      1,000,000           NR/NR  Hamden Facility Revenue Bonds, Series 2009A,
                                 7.75%, 1/1/43                                               1,013,660
      5,000,000         CCC+/NR  Mohegan Tribe Indians Gaming Authority,
                                 6.25%, 1/1/31                                               3,941,050
                                                                                         -------------
                                                                                         $  15,809,974
------------------------------------------------------------------------------------------------------


The accompanying notes are an integral part of these financial statements.

12     Pioneer Municipal High Income Trust | Annual Report | 4/30/11




------------------------------------------------------------------------------------------------------
                   S&P/Moody's
Principal          Ratings
Amount             (unaudited)                                                           Value
------------------------------------------------------------------------------------------------------
                                                                               
                                 District of Columbia -- 3.6%
  $  5,000,000         BBB/Baa3  District of Columbia Tobacco Settlement Financing
                                 Corp., 6.5%, 5/15/33                                    $   4,885,450
     6,000,000         BBB/Baa3  District of Columbia Tobacco Settlement Financing
                                 Corp., 6.75%, 5/15/40                                       5,490,120
                                                                                         -------------
                                                                                         $  10,375,570
------------------------------------------------------------------------------------------------------
                                 Florida -- 5.4%
     1,700,000            NR/NR  Beacon Lakes Community Development,
                                 6.9%, 5/1/35                                            $   1,583,652
     1,000,000            NR/NR  Florida Development Finance Corp., 6.0%, 9/15/40              839,300
     1,000,000+           NR/WR  Hillsborough County Industrial Development Authority
                                 Revenue, 8.0%, 8/15/32                                      1,375,330
     2,390,000            NR/NR  Liberty County Subordinate Revenue,
                                 8.25%, 7/1/28                                               2,335,651
     2,500,000            A-/A2  Miami-Dade County Aviation Revenue,
                                 5.5%, 10/1/41                                               2,414,725
     1,000,000            NR/NR  St. Johns County Industrial Development Authority
                                 Revenue, 5.25%, 1/1/26                                        807,090
     2,000,000            NR/NR  St. Johns County Industrial Development Authority
                                 Revenue, 5.375%, 1/1/40                                     1,440,620
     5,000,000          NR/Baa1  Tallahassee Health Facilities Revenue,
                                 6.375%, 12/1/30                                             4,996,850
                                                                                         -------------
                                                                                         $  15,793,218
------------------------------------------------------------------------------------------------------
                                 Georgia -- 2.2%
     4,240,000(a)        NR/Aa3  Atlanta Georgia Water & Waste Revenue, RIB,
                                 12.492%, 11/1/43 (144A)                                 $   3,538,365
       500,000          CCC+/NR  Clayton County Development Authority Revenue,
                                 9.0%, 6/1/35                                                  527,780
     2,400,000            NR/NR  Fulton County Residential Care Facilities Revenue,
                                 5.0%, 7/1/27                                                1,627,032
     1,100,000            NR/NR  Fulton County Residential Care Facilities Revenue,
                                 5.125%, 7/1/42                                                659,461
                                                                                         -------------
                                                                                         $   6,352,638
------------------------------------------------------------------------------------------------------
                                 Idaho -- 1.7%
     5,000,000        BBB+/Baa1  Power County Industrial Development Corp.,
                                 6.45%, 8/1/32                                           $   5,007,150
------------------------------------------------------------------------------------------------------
                                 Illinois -- 18.0%
     2,000,000(c)         NR/NR  Centerpoint Intermodal Center, 8.5%,
                                 6/15/23 (144A)                                          $   1,998,360
    12,000,000          NR/Caa2  Chicago O'Hare International Airport Special Facility
                                 Revenue Refunding Bonds, 5.5%, 12/1/30                      8,635,920
     1,000,000            NR/NR  Illinois Finance Authority Revenue, 6.0%, 11/15/27            600,100
     3,865,000          BBB+/NR  Illinois Finance Authority Revenue, 6.0%, 8/15/38           3,671,054
     2,000,000          AA+/Aa2  Illinois Finance Authority Revenue, 6.0%, 8/15/39           2,069,740


The accompanying notes are an integral part of these financial statements.

            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     13


Schedule of Investments | 4/30/11 (continued)



-----------------------------------------------------------------------------------------------------
                   S&P/Moody's
Principal          Ratings
Amount             (unaudited)                                                          Value
-----------------------------------------------------------------------------------------------------
                                                                              
                                 Illinois -- (continued)
  $   4,000,000           NR/NR  Illinois Finance Authority Revenue, 6.0%, 11/15/39     $   2,195,400
      2,450,000           NR/NR  Illinois Finance Authority Revenue, 6.375%, 5/15/17        2,384,609
      2,500,000         NR/Baa2  Illinois Finance Authority Revenue, 6.5%, 4/1/39           2,427,225
        500,000           NR/NR  Illinois Finance Authority Revenue, 7.0%, 5/15/18            482,000
      1,700,000           NR/NR  Illinois Finance Authority Revenue, 7.625%, 5/15/25        1,618,570
        600,000           NR/NR  Illinois Finance Authority Revenue, 7.75%, 5/15/30           568,650
      2,000,000           NR/NR  Illinois Finance Authority Revenue, 8.0%, 5/15/40          1,886,580
      3,200,000           NR/NR  Illinois Finance Authority Revenue, 8.0%, 5/15/46          3,011,616
      2,500,000           NR/NR  Illinois Finance Authority Revenue, 8.25%, 2/15/46         2,367,750
      4,000,000           NR/NR  Illinois Finance Authority Revenue, 8.25%, 5/15/45         3,820,920
      1,500,000(b)        NR/NR  Illinois Health Facilities Authority Revenue,
                                 6.9%, 11/15/33                                               556,050
     16,880,000(d)       AAA/A2  Metropolitan Pier & Exposition Authority Dedicated
                                 State Tax Revenue, 0.0%, 6/15/22                          13,084,363
      1,625,000           NR/NR  Southwestern Illinois Development Authority
                                 Revenue, 5.625%, 11/1/26                                   1,094,698
                                                                                        -------------
                                                                                        $  52,473,605
-----------------------------------------------------------------------------------------------------
                                 Indiana -- 3.1%
      5,000,000           A+/A1  Indiana Health & Educational Facility Financing
                                 Authority Hospital Revenue, 5.0%, 2/15/39              $   4,220,700
      2,800,000         BBB-/WR  Indiana State Development Finance Authority
                                 Revenue, 5.75%, 10/1/11                                    2,811,480
      2,570,000           NR/NR  Vigo County Hospital Authority Revenue, 5.8%,
                                 9/1/47 (144A)                                              1,899,590
                                                                                        -------------
                                                                                        $   8,931,770
-----------------------------------------------------------------------------------------------------
                                 Louisiana -- 2.0%
      1,500,000        BBB-/Ba2  Louisiana Local Government Environmental Facilities
                                 Revenue, 6.75%, 11/1/32                                $   1,528,050
      5,000,000         NR/Baa1  Louisiana Public Facilities Authority Revenue,
                                 5.5%, 5/15/47                                              4,133,750
                                                                                        -------------
                                                                                        $   5,661,800
-----------------------------------------------------------------------------------------------------
                                 Maryland -- 0.3%
      1,000,000           NR/NR  Maryland Health & Higher Educational Facilities
                                 Authority Revenue, 6.25%, 1/1/45                       $     965,890
-----------------------------------------------------------------------------------------------------
                                 Massachusetts -- 7.5%
      7,100,000            A/WR  Massachusetts Development Finance Agency
                                 Revenue, 5.75%, 1/1/42                                 $   6,890,479
      2,360,000           NR/NR  Massachusetts Development Finance Agency
                                 Revenue, 7.1%, 7/1/32                                      2,103,586
        955,000           AA/NR  Massachusetts Educational Financing Authority
                                 Revenue, 6.0%, 1/1/28                                      1,001,594
      3,500,000+          NR/WR  Massachusetts Health & Educational Facilities
                                 Authority Revenue, 6.25%, 7/1/22                           3,762,780


The accompanying notes are an integral part of these financial statements.

14     Pioneer Municipal High Income Trust | Annual Report | 4/30/11




---------------------------------------------------------------------------------------------------------------
                         S&P/Moody's
Principal                Ratings
Amount                   (unaudited)                                                              Value
---------------------------------------------------------------------------------------------------------------
                                                                                        
                                       Massachusetts -- (continued)
    $   4,500,000               NR/NR  Massachusetts Health & Educational Facilities
                                       Authority Revenue, 6.5%, 1/15/38                           $   3,658,950
        5,000,000              BB-/NR  Massachusetts Health & Educational Facilities
                                       Authority Revenue, 6.75%, 10/1/33                              4,523,100
                                                                                                  -------------
                                                                                                  $  21,940,489
---------------------------------------------------------------------------------------------------------------
                                       Michigan -- 2.8%
          935,000               NR/NR  Doctor Charles Drew Academy, 5.7%, 11/1/36                 $     571,481
        1,340,000              NR/Ba1  Flint Michigan Hospital Building Authority Revenue,
                                       5.25%, 7/1/16                                                  1,293,448
        1,500,000               BB/NR  John Tolfree Health System Corp., 6.0%, 9/15/23                1,221,045
        5,830,000               BB/NR  Michigan Tobacco Settlement Finance Authority,
                                       6.0%, 6/1/48                                                   3,960,319
        1,430,000              BBB/NR  Star International Academy Certificates of
                                       Participation, 6.125%, 3/1/37                                  1,209,623
                                                                                                  -------------
                                                                                                  $   8,255,916
---------------------------------------------------------------------------------------------------------------
                                       Minnesota -- 0.9%
        1,675,000              BB-/NR  Duluth Economic Development Authority Health Care
                                       Facilities Revenue, 7.25%, 6/15/32                         $   1,628,150
        1,000,000               NR/NR  Port Authority of the City of Bloomington Minnesota
                                       Facility Revenue Bonds, 9.0%, 12/1/35                            999,950
                                                                                                  -------------
                                                                                                  $   2,628,100
---------------------------------------------------------------------------------------------------------------
                                       Mississippi -- 1.0%
        3,000,000             BBB/Ba1  Mississippi Business Finance Corp. Pollution Control
                                       Revenue, 5.9%, 5/1/22                                      $   2,934,780
---------------------------------------------------------------------------------------------------------------
                                       Montana -- 0.1%
        1,600,000(b)(e)         NR/NR  Two Rivers Authority, Inc. Correctional Facility
                                       Improvement Revenue, 7.375%, 11/1/27                       $     245,600
---------------------------------------------------------------------------------------------------------------
                                       Nebraska -- 0.2%
        2,000,000(b)(e)         NR/NR  Grand Island Solid Waste Disposal Facilities
                                       Revenue, 7.0%, 6/1/23                                      $     555,820
---------------------------------------------------------------------------------------------------------------
                                        Nevada -- 0.0%*
        2,000,000(b)(e)         NR/NR  Nevada State Department of Business & Industry,
                                       7.25%, 1/1/23                                              $          20
---------------------------------------------------------------------------------------------------------------
                                       New Jersey -- 9.7%
        1,000,000                B/B3  New Jersey Economic Development Authority
                                       Revenue, 6.25%, 9/15/19                                    $     945,710
       13,350,000                B/B3  New Jersey Economic Development Authority
                                       Revenue, 6.25%, 9/15/29                                       12,168,392
        6,150,000(c)             B/B3  New Jersey Economic Development Authority
                                       Revenue, 7.0%, 11/15/30                                        5,993,483
        8,000,000+            AAA/Aaa  Tobacco Settlement Financing Corp., 6.75%, 6/1/39              8,997,040
                                                                                                  -------------
                                                                                                  $  28,104,625
---------------------------------------------------------------------------------------------------------------


The accompanying notes are an integral part of these financial statements.

            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     15


Schedule of Investments | 4/30/11 (continued)



-----------------------------------------------------------------------------------------------------
                   S&P/Moody's
Principal          Ratings
Amount             (unaudited)                                                          Value
-----------------------------------------------------------------------------------------------------
                                                                              
                                 New Mexico -- 1.3%
  $  1,500,000            NR/NR  Otero County New Mexico Project Revenue, 6.0%,
                                 4/1/23                                                 $   1,295,895
     2,960,000            NR/NR  Otero County New Mexico Project Revenue, 6.0%,
                                 4/1/28                                                     2,360,304
                                                                                        -------------
                                                                                        $   3,656,199
-----------------------------------------------------------------------------------------------------
                                 New York -- 9.2%
     3,000,000            NR/NR  Dutchess County Industrial Development Agency
                                 Revenue, 7.5%, 3/1/29                                  $   2,833,890
     2,000,000          BBB+/NR  Hempstead Local Development Corp. Revenue
                                 Bonds, 5.75%, 7/1/39                                       1,934,860
     2,050,000            NR/NR  Nassau County New York Industrial Development
                                 Agency Revenue, 6.7%, 1/1/43                               1,899,100
       990,000        CCC+/Caa2  New York City Industrial Development Agency, 6.9%,
                                 8/1/24                                                       832,075
     2,000,000           BB-/B1  New York City Industrial Development Agency,
                                 7.625%, 12/1/32                                            2,006,980
     2,000,000          B-/Caa2  New York City Industrial Development Agency, 8.0%,
                                 8/1/12                                                     2,065,340
     1,000,000           NR/Ba1  New York State Dormitory Authority Revenue,
                                 6.125%, 12/1/29                                              925,040
     7,040,000(a)        NR/Aaa  New York State Dormitory Authority Revenue, RIB,
                                 15.125%, 7/1/26 (144A)                                     8,969,030
     2,750,000            BB/NR  Seneca Nation Indians Capital Improvement
                                 Authority Revenue, 5.25%, 12/1/16 (144A)                   2,566,823
     3,000,000            NR/NR  Suffolk County Industrial Development Agency,
                                 7.25%, 1/1/30                                              2,855,610
                                                                                        -------------
                                                                                        $  26,888,748
-----------------------------------------------------------------------------------------------------
                                 North Carolina -- 3.0%
     4,935,000            NR/NR  Charlotte North Carolina Special Facilities Revenue,
                                 5.6%, 7/1/27                                           $   4,016,498
     4,795,000            NR/NR  Charlotte North Carolina Special Facilities Revenue,
                                 7.75%, 2/1/28                                              4,794,233
                                                                                        -------------
                                                                                        $   8,810,731
-----------------------------------------------------------------------------------------------------
                                 Oklahoma -- 1.9%
     1,225,000          B-/Caa2  Tulsa Municipal Airport Revenue, 6.25%, 6/1/20         $   1,165,857
     4,350,000          B-/Caa2  Tulsa Municipal Airport Revenue, 7.35%, 12/1/11            4,354,350
                                                                                        -------------
                                                                                        $   5,520,207
-----------------------------------------------------------------------------------------------------
                                 Pennsylvania -- 2.8%
     1,550,000          NR/Baa2  Allegheny County Hospital Development Authority
                                 Revenue, 5.125%, 5/1/25                                $   1,370,696
     1,000,000           CCC/NR  Columbia County Hospital Authority Health Care
                                 Revenue, 5.9%, 6/1/29                                        781,450


The accompanying notes are an integral part of these financial statements.

16     Pioneer Municipal High Income Trust | Annual Report | 4/30/11




---------------------------------------------------------------------------------------------------------
                       S&P/Moody's
Principal              Ratings
Amount                 (unaudited)                                                          Value
---------------------------------------------------------------------------------------------------------
                                                                                  
                                     Pennsylvania -- (continued)
    $   755,000             BBB/Ba1  Hazleton Health Services Authority Hospital Revenue,
                                     5.625%, 7/1/17                                         $     740,504
      1,280,000(b)            NR/Ca  Langhorne Manor Borough Higher Education &
                                     Health Authority Revenue, 7.35%, 7/1/22                      447,360
      5,000,000              B/Caa2  Pennsylvania Economic Development Financing
                                     Authority Solid Waste Disposal Revenue,
                                     6.0%, 6/1/31                                               4,197,950
        500,000             BBB+/NR  Pennsylvania Higher Educational Facilities Authority
                                     Revenue, 5.4%, 7/15/36                                       476,170
                                                                                            -------------
                                                                                            $   8,014,130
---------------------------------------------------------------------------------------------------------
                                     Rhode Island -- 1.6%
      6,000,000(e)            NR/NR  Central Falls Detention Facilities Revenue, 7.25%,
                                     7/15/35                                                $   4,801,080
---------------------------------------------------------------------------------------------------------
                                     South Carolina -- 1.5%
      3,185,000+          BBB+/Baa1  South Carolina Jobs Economic Development
                                     Authority Revenue, 6.375%, 8/1/34                      $   3,566,340
        665,000+          BBB+/Baa1  South Carolina Jobs Economic Development
                                     Authority Revenue, 6.375%, 8/1/34                            747,653
                                                                                            -------------
                                                                                            $   4,313,993
---------------------------------------------------------------------------------------------------------
                                     Tennessee -- 4.8%
      7,000,000+              NR/A2  Johnson City Health & Educational Facilities Board
                                     Hospital Revenue, 7.5%, 7/1/33                         $   7,653,940
      2,480,000               NR/A1  Knox County Health, Educational & Housing Facilities
                                     Board Hospital Revenue,
                                     6.375%, 4/15/22                                            2,589,790
      4,600,000             BBB+/NR  Sullivan County Health, Educational & Housing
                                     Facilities Board Hospital Revenue,
                                     5.25%, 9/1/36                                              3,786,628
                                                                                            -------------
                                                                                            $  14,030,358
---------------------------------------------------------------------------------------------------------
                                     Texas -- 14.7%
      1,345,000               NR/B3  Bexar County Housing Finance Corp., 8.0%, 12/1/36      $     924,540
      1,000,000           CCC+/Caa2  Dallas-Fort Worth International Airport Revenue,
                                     6.0%, 11/1/14                                                965,330
      4,000,000               NR/NR  Decatur Hospital Authority Revenue, 7.0%, 9/1/25           3,883,520
        769,709(b)(e)         NR/NR  Gulf Coast Industrial Development Authority
                                     Revenue, 7.0%, 12/1/36                                        43,296
      3,750,000             CCC+/B3  Houston Airport System Special Facilities Revenue,
                                     5.7%, 7/15/29                                              3,217,650
      5,340,000               NR/NR  Lubbock Health Facilities Development Corp.,
                                     6.625%, 7/1/36                                             4,645,747
     10,000,000             BBB+/A3  North Texas Tollway Authority Revenue,
                                     5.75%, 1/1/33                                              9,889,200


The accompanying notes are an integral part of these financial statements.

            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     17


Schedule of Investments | 4/30/11 (continued)



-------------------------------------------------------------------------------------------------------
                     S&P/Moody's
Principal            Ratings
Amount               (unaudited)                                                          Value
-------------------------------------------------------------------------------------------------------
                                                                                
                                   Texas -- (continued)
   $   2,810,000(a)        NR/Aaa  Northside Independent School District, RIB,
                                   13.143%, 6/15/33 (144A)                                $   2,959,267
       2,000,000            NR/NR  Tarrant County Cultural Education Facilities Finance
                                   Corp., 8.0%, 11/15/34                                      1,918,360
       1,000,000            NR/NR  Tarrant County Cultural Education Facilities Finance
                                   Corp., 8.125%, 11/15/39                                      955,090
       1,500,000            NR/NR  Tarrant County Cultural Education Facilities Finance
                                   Corp., 8.25%, 11/15/44                                     1,452,840
       7,040,000(a)        NR/Aaa  Texas State, RIB, 14.194%, 4/1/30 (144A)                   7,680,218
       5,000,000            NR/NR  Willacy County Local Government Corp. Revenue,
                                   6.875%, 9/1/28                                             4,269,300
                                                                                          -------------
                                                                                          $  42,804,358
-------------------------------------------------------------------------------------------------------
                                   Utah -- 0.2%
         800,000            NR/NR  Spanish Fork City Charter School Revenue, 5.55%,
                                   11/15/26 (144A)                                        $     636,384
-------------------------------------------------------------------------------------------------------
                                   Vermont -- 0.5%
       1,500,000          A-/Baa1  Vermont Educational & Health Buildings Financing
                                   Agency Revenue, 6.0%, 10/1/28                          $   1,528,275
-------------------------------------------------------------------------------------------------------
                                   Virginia -- 0.3%
       1,000,000         BBB/Baa2  Peninsula Ports Authority, 6.0%, 4/1/33                $   1,003,650
-------------------------------------------------------------------------------------------------------
                                   Washington -- 9.7%
       4,710,000           A+/Aa3  Spokane Public Facilities District Hotel/Motel Tax &
                                   Sales, 5.75%, 12/1/27                                  $   4,838,253
       7,025,000         BBB/Baa3  Tobacco Settlement Authority Revenue, 6.625%,
                                   6/1/32                                                     6,949,762
      14,315,000          AA+/Aa1  Washington State General Obligation, 0.0%, 6/1/22          9,138,123
       3,795,000             A/A2  Washington State Health Care Facilities Authority
                                   Revenue, 6.0%, 1/1/33                                      3,797,049
       5,000,000            NR/NR  Washington State Housing Finance Committee
                                   Nonprofit Revenue, 5.625%, 1/1/27                          3,386,850
                                                                                          -------------
                                                                                          $  28,110,037
-------------------------------------------------------------------------------------------------------
                                   West Virginia -- 0.5%
       1,495,000            NR/NR  West Virginia Hospital Finance Authority Hospital
                                   Revenue Bonds, 9.125%, 10/1/41                         $   1,502,834
-------------------------------------------------------------------------------------------------------
                                   TOTAL TAX-EXEMPT OBLIGATIONS
                                   (Cost $382,918,025)                                    $ 375,805,724
-------------------------------------------------------------------------------------------------------


The accompanying notes are an integral part of these financial statements.

18     Pioneer Municipal High Income Trust | Annual Report | 4/30/11




---------------------------------------------------------------------------------------------------------
                            S&P/Moody's
Principal                   Ratings
Amount                      (unaudited)                                                  Value
---------------------------------------------------------------------------------------------------------
                                                                                
                                          MUNICIPAL COLLATERALIZED DEBT
                                          OBLIGATION -- 2.1% of Net Assets
     $10,000,000(c)(e)       NR/NR        Non-Profit Preferred Funding Trust I, 12.0%,
                                          9/15/37 (144A)                                  $    6,190,900
---------------------------------------------------------------------------------------------------------
                                          TOTAL MUNICIPAL COLLATERALIZED
                                          DEBT OBLIGATION
                                          (Cost $10,000,000)                              $    6,190,900
---------------------------------------------------------------------------------------------------------


Shares
---------------------------------------------------------------------------------------------------------
                                                                                
                                          COMMON STOCK -- 0.9% of Net Assets
         250,413(f)                       Delta Air Lines, Inc.                           $    2,599,287
---------------------------------------------------------------------------------------------------------
                                          TOTAL COMMON STOCK
                                          (Cost $6,612,756)                               $    2,599,287
---------------------------------------------------------------------------------------------------------
                                          TOTAL INVESTMENTS IN SECURITIES -- 132.1%
                                          (Cost $399,530,781)(g)(h)                       $  384,595,911
---------------------------------------------------------------------------------------------------------
                                          OTHER ASSETS AND LIABILITIES -- 2.6%            $    7,461,343
---------------------------------------------------------------------------------------------------------
                                          PREFERRED SHARES AT REDEMPTION VALUE,
                                          INCLUDING DIVIDENDS PAYABLE -- (34.7)%          $ (101,003,894)
---------------------------------------------------------------------------------------------------------
                                          NET ASSETS APPLICABLE TO COMMON
                                          SHAREOWNERS -- 100.0%                           $  291,053,360
=========================================================================================================
 

*      Amount rounds to less than 0.1%.

(144A) Security is exempt from registration under Rule 144A of the Securities
       Act of 1933. Such securities may be resold normally to qualified
       institutional buyers in a transaction exempt from registration. At April
       30, 2011 the value of these securities amounted to $53,575,944, or 18.4%
       of net assets applicable to common shareowners.

RIB    Residual Interest Bonds

NR     Security not rated by S&P or Moody's.

WR     Security rating withdrawn by S&P or Moody's.

+      Prerefunded bonds have been collateralized by U.S. Treasury securities or
       U.S. Government Agencies which are held in escrow to pay interest and
       principal on the tax exempt issue and to retire the bonds in full at the
       earliest refunding date.

(a)    The interest rate is subject to change periodically and inversely based
       upon prevailing market rates. The interest rate shown is the coupon rate
       at April 30, 2011.

(b)    Security is in default and is non-income producing.

(c)    The interest rate is subject to change periodically. The interest rate
       shown is the coupon rate at April 30, 2011.

(d)    Debt obligation initially issued at one coupon rate which converts to a
       higher coupon rate at a specific date. The rate shown is the coupon rate
       at April 30, 2011.


The accompanying notes are an integral part of these financial statements.

            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     19


Schedule of Investments | 4/30/11 (continued)

(e)    Indicates a security that has been deemed illiquid. The aggregate cost of
       illiquid securities is $22,125,015. The aggregate fair value is
       $11,836,716, or 4.1% of the total net assets applicable to common
       shareowners.

(f)    Non-income producing.

(g)    The concentration of investments by type of obligation/market sector is
       as follows:


                                                                    
        Insured:
         NATL-RE                                                          7.1%
         FSA                                                              2.6
         AMBAC                                                            1.8
         PSF                                                              0.8
         ACA                                                              0.3
        Revenue Bonds:
         Health Revenue                                                  28.3
         Other Revenue                                                   11.9
         Tobacco Revenue                                                 11.6
         Airport Revenue                                                  9.8
         Development Revenue                                              8.3
         Education Revenue                                                5.4
         Facilities Revenue                                               4.3
         Pollution Control Revenue                                        3.3
         Transportation Revenue                                           2.6
         Gaming Revenue                                                   1.7
         Housing Revenue                                                  0.2
         Utilities Revenue**                                               --
                                                                        -----
                                                                        100.0%
                                                                        =====


**     Amount is less than 0.1%

(h)    At April 30, 2011, the net unrealized loss on investments based on cost
       for federal income tax purposes of $398,634,012 was as follows:



                                                                 
          Aggregate gross unrealized gain for all investments in
            which there is an excess of value over tax cost         $ 22,723,642
          Aggregate gross unrealized loss for all investments in
            which there is an excess of tax cost over value          (36,761,743)
                                                                    ------------
          Net unrealized loss                                       $(14,038,101)
                                                                    ============


For financial reporting purposes net unrealized loss on investments was
$14,934,870 and cost of investments aggregated $399,530,781.

Purchases and sales of securities (excluding temporary cash investments) for
the period ended April 30, 2011, aggregated $42,509,344 and $40,748,704,
respectively.


The accompanying notes are an integral part of these financial statements.

20     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


Various inputs are used in determining the value of the Trust's investments.
These inputs are summarized in the three broad levels listed below.

Highest priority is given to Level 1 inputs and lowest priority is given to
Level 3.


          
  Level 1 -- quoted prices in active markets for identical securities
  Level 2 -- other significant observable inputs (including quoted prices for
             similar securities, interest rates, prepayment speeds, credit
             risk, etc.)
  Level 3 -- significant unobservable inputs (including the Trust's own
             assumptions in determining fair value of investments)


     The following is a summary of the inputs used as of April 30, 2011, in
valuing the Trust's investments:



------------------------------------------------------------------------------------------------------
                                              Level 1        Level 2          Level 3     Total
------------------------------------------------------------------------------------------------------
                                                                              
 Tax exempt obligations                       $       --     $375,805,724        $--      $375,805,724
 Municipal collateralized debt obligation             --        6,190,900         --         6,190,900
 Common stock                                  2,599,287               --         --         2,599,287
------------------------------------------------------------------------------------------------------
 Total                                        $2,599,287     $381,996,624        $--      $384,595,911
======================================================================================================


The accompanying notes are an integral part of these financial statements.

            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     21


Statement of Assets and Liabilities | 4/30/11


                                                                  
ASSETS:
  Investments in securities, at value (cost $399,530,781)            $384,595,911
  Receivables --
   Interest                                                             8,954,415
   Reinvestment of distributions                                          153,908
  Prepaid expenses                                                         22,854
  Other assets                                                             50,477
----------------------------------------------------------------------------------
     Total assets                                                    $393,777,565
----------------------------------------------------------------------------------
LIABILITIES:
  Payables --
   Investment securities purchased                                   $  1,000,000
  Due to custodian                                                        186,865
  Due to affiliates                                                       198,552
  Administration fee payable                                              185,948
  Accrued expenses                                                        148,946
----------------------------------------------------------------------------------
     Total liabilities                                               $  1,720,311
----------------------------------------------------------------------------------
PREFERRED SHARES AT REDEMPTION VALUE:
  $25,000 liquidation value per share applicable to 4,040 shares,
   including dividends payable of $3,894                             $101,003,894
----------------------------------------------------------------------------------
NET ASSETS APPLICABLE TO COMMON SHAREOWNERS:
  Paid-in capital                                                    $318,663,817
  Undistributed net investment income                                  11,805,398
  Accumulated net realized loss on investments                        (24,480,985)
  Net unrealized loss on investments                                  (14,934,870)
----------------------------------------------------------------------------------
   Net assets applicable to common shareowners                       $291,053,360
----------------------------------------------------------------------------------
NET ASSET VALUE PER COMMON SHARE:
No par value (unlimited number of shares authorized)
  Based on $291,053,360/22,381,423 common shares                     $      13.00
==================================================================================


The accompanying notes are an integral part of these financial statements.

22     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


Statement of Operations

For the Year Ended 4/30/11


                                                                              
INVESTMENT INCOME:
  Interest                                                                          $ 28,444,553
------------------------------------------------------------------------------------------------
EXPENSES:
  Management fees                                                $ 2,424,677
  Administration fees                                                390,461
  Transfer agent fees and expenses                                    12,461
  Shareowner communication expenses                                   47,707
  Auction agent fees                                                 267,788
  Custodian fees                                                      19,309
  Registration fees                                                   40,036
  Professional fees                                                  107,422
  Printing expense                                                    20,883
  Trustees' fees                                                      13,739
  Pricing fees                                                        21,682
  Miscellaneous                                                       41,078
------------------------------------------------------------------------------------------------
     Total expenses                                                                 $  3,407,243
------------------------------------------------------------------------------------------------
       Net investment income                                                        $ 25,037,310
------------------------------------------------------------------------------------------------
REALIZED AND UNREALIZED LOSS ON INVESTMENTS:
  Net realized loss from investments                             $  (668,700)
  Change in net unrealized gain (loss) on investments            (19,362,413)
------------------------------------------------------------------------------------------------
   Net loss on investments                                                          $(20,031,113)
------------------------------------------------------------------------------------------------
DISTRIBUTIONS TO PREFERRED SHAREOWNERS FROM NET
INVESTMENT INCOME:                                                                  $   (421,969)
------------------------------------------------------------------------------------------------
  Net increase in net assets applicable to common shareowners
   resulting from operations                                                        $  4,584,228
================================================================================================


The accompanying notes are an integral part of these financial statements.

            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     23


Statement of Changes in Net Assets

For the Years Ended 4/30/11 and 4/30/10, respectively



----------------------------------------------------------------------------------------------
                                                              Year               Year
                                                              Ended              Ended
                                                              4/30/11            4/30/10
----------------------------------------------------------------------------------------------
                                                                           
FROM OPERATIONS:
Net investment income                                         $ 25,037,310       $ 25,942,123
Net realized loss on investments                                  (668,700)        (1,491,778)
Change in net unrealized gain (loss) on investments            (19,362,413)        56,977,837
Distributions to preferred shareowners from net investment
  income                                                          (421,969)          (468,476)
----------------------------------------------------------------------------------------------
     Net increase in net assets applicable to common
       shareowners resulting from operations                  $  4,584,228       $ 80,959,706
----------------------------------------------------------------------------------------------
DISTRIBUTIONS TO COMMON SHAREOWNERS:
Net investment income
  ($1.065 and $0.97 per share, respectively)                  $(23,762,562)      $(21,516,929)
----------------------------------------------------------------------------------------------
     Total distributions to common shareowners                $(23,762,562)      $(21,516,929)
----------------------------------------------------------------------------------------------
FROM TRUST SHARE TRANSACTIONS:
Reinvestment of distributions                                 $  1,775,707       $  1,453,202
----------------------------------------------------------------------------------------------
   Net increase in net assets applicable to common
     shareowners resulting from Trust share transactions      $  1,775,707       $  1,453,202
----------------------------------------------------------------------------------------------
   Net increase (decrease) in net assets applicable to
     common shareowners                                       $(17,402,627)      $ 60,895,979
NET ASSETS APPLICABLE TO COMMON SHAREOWNERS:
Beginning of year                                              308,455,987        247,560,008
----------------------------------------------------------------------------------------------
End of year                                                   $291,053,360       $308,455,987
----------------------------------------------------------------------------------------------
Undistributed net investment income                           $ 11,805,398       $ 11,320,757
=============================================================================================


The accompanying notes are an integral part of these financial statements.

24     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


Financial Highlights



------------------------------------------------------------------------------------------------------------------------------------
                                                                                 Year       Year      Year       Year       Year
                                                                                 Ended      Ended     Ended      Ended      Ended
                                                                                 4/30/11    4/30/10   4/30/09    4/30/08    4/30/07
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                             
Per Common Share Operating Performance
Net asset value, beginning of period                                             $ 13.86    $11.18    $ 14.07    $ 16.02    $ 15.15
------------------------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations: (a)
 Net investment income                                                           $  1.12    $ 1.17    $  1.12    $  1.08    $  1.02
 Net realized and unrealized gain (loss) on investments and interest rate swaps    (0.89)     2.50      (3.05)     (2.03)      0.78
 Dividends and distributions to preferred shareowners from:
  Net investment income                                                            (0.02)    (0.02)     (0.11)     (0.17)     (0.16)
------------------------------------------------------------------------------------------------------------------------------------
  Net increase (decrease) from investment operations                             $  0.21    $ 3.65    $ (2.04)   $ (1.12)   $  1.64
Dividends and distributions to common shareowners from:
 Net investment income                                                             (1.07)    (0.97)     (0.85)     (0.83)     (0.77)
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                                       $ (0.86)   $ 2.68    $ (2.89)   $ (1.95)   $  0.87
------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period (b)                                               $ 13.00    $13.86    $ 11.18    $ 14.07    $ 16.02
====================================================================================================================================
Market value, end of period (b)                                                  $ 13.40    $14.34    $ 10.40    $ 13.88    $ 15.05
====================================================================================================================================
Total return at market value (c)                                                    1.04%    48.69%    (18.85)%    (2.28)%    20.04%
Ratios to average net assets of common shareowners
 Net expenses (d)                                                                   1.12%     1.14%      1.19%      1.03%      1.06%
 Net investment income before preferred share dividends                             8.26%     9.07%      9.36%      7.17%      6.49%
 Preferred share dividends                                                          0.14%     0.16%      0.95%      1.13%      1.01%
 Net investment income available to common shareowners                              8.12%     8.91%      8.41%      6.04%      5.48%


The accompanying notes are an integral part of these financial statements.

             Pioneer Municipal High Income Trust | Annual Report | 4/30/11    25


Financial Highlights (continued)



------------------------------------------------------------------------------------------------------------------------------------
                                                                      Year         Year         Year         Year         Year
                                                                      Ended        Ended        Ended        Ended        Ended
                                                                      4/30/11      4/30/10      4/30/09      4/30/08      4/30/07
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                           
Portfolio turnover                                                          10%          11%          16%          17%          18%
Net assets of common shareowners, end of period (in thousands)        $291,053     $308,456     $247,560     $311,231     $354,486
Preferred shares outstanding (in thousands)                           $101,000     $101,000     $101,000     $101,000     $101,000
Asset coverage per preferred share, end of period (e)                 $ 97,044     $101,351     $ 86,278     $102,047     $112,759
Average market value per preferred share                              $ 25,000     $ 25,000     $ 25,000     $ 25,000     $ 25,000
Liquidation value, including dividends payable, per preferred share   $ 25,001     $ 25,001     $ 25,001     $ 25,010     $ 25,014
Ratios to average net assets of common shareowners before waivers
 and reimbursement of expenses
 Net expenses (d)                                                         1.12%        1.14%        1.19%        1.03%        1.06%
 Net investment income before preferred share dividends                   8.26%        9.07%        9.36%        7.17%        6.49%
 Preferred share dividends                                                0.14%        0.16%        0.95%        1.13%        1.01%
 Net investment income available to common shareowners                    8.12%        8.91%        8.41%        6.04%        5.48%
====================================================================================================================================


(a)  The per common share data presented above is based upon the average common
     shares outstanding for the periods presented.
(b)  Net asset value and market value are published in Barron's on Saturday, The
     Wall Street Journal on Monday and The New York Times on Monday and
     Saturday.
(c)  Total investment return is calculated assuming a purchase of common shares
     at the current market value on the first day and a sale at the current
     market value on the last day of the periods reported. Dividends and
     distributions, if any, are assumed for purposes of this calculation to be
     reinvested at prices obtained under the Trust's dividend reinvestment plan.
     Total investment return does not reflect brokerage commissions. Past
     performance is not a guarantee of future results.
(d)  Expense ratios do not reflect the effect of dividend payments to preferred
     shareowners.
(e)  Market value is redemption value without an active market.

     The information above represents the operating performance data for a
     common share outstanding, total investment return, ratios to average net
     assets and other supplemental data for the periods indicated. This
     information has been determined based upon financial information provided
     in the financial statements and market value data for the Trust's common
     shares.

The accompanying notes are an integral part of these financial statements.

26    Pioneer Municipal High Income Trust | Annual Report | 4/30/11


Notes to Financial Statements | 4/30/11

1. Organization and Significant Accounting Policies

Pioneer Municipal High Income Trust (the Trust) was organized as a Delaware
statutory trust on March 13, 2003. Prior to commencing operations on July 21,
2003, the Trust had no operations other than matters relating to its
organization and registration as a diversified, closed-end management
investment company under the Investment Company Act of 1940, as amended. The
primary investment objective of the Trust is to seek a high level of current
income exempt from regular federal income tax and, as a secondary investment
objective, the Trust may seek capital appreciation to the extent consistent
with its primary investment objective.

Information regarding the Trust's principal risks is contained in the Trust's
original offering prospectus, with additional information included in the
Trust's shareowner reports issued from time to time. Please refer to those
documents when considering the Trust's principal risks. At times, the Trust's
investments may represent industries or industry sectors that are interrelated
or have common risks, making the Trust more susceptible to any economic,
political, or regulatory developments or other risks affecting those industries
and sectors.

The Trust may invest in both investment grade and below investment grade
(high-yield) municipal securities with a broad range of maturities and credit
ratings. Debt securities rated below investment grade are commonly referred to
as "junk bonds" and are considered speculative. These securities involve
greater risk of loss, are subject to greater price volatility, and are less
liquid, especially during periods of economic uncertainty or change, than
higher rated debt securities.

The Trust's financial statements have been prepared in conformity with U.S.
generally accepted accounting principles that require the management of the
Trust to, among other things, make estimates and assumptions that affect the
reported amounts of assets and liabilities, the disclosure of contingent assets
and liabilities at the date of the financial statements, and the reported
amounts of income, expenses and gains or losses on investments during the
reporting period. Actual results could differ from those estimates.

The following is a summary of significant accounting policies followed by the
Trust in the preparation of its financial statements, which are consistent with
those policies generally accepted in the investment company industry:


            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     27


A. Security Valuation

   Security transactions are recorded as of trade date. Fixed income securities
   with remaining maturity of more than sixty days are valued at prices supplied
   by independent pricing services, which consider such factors as market
   prices, market events, quotations from one or more brokers, Treasury spreads,
   yields, maturities and ratings. Valuations may be supplemented by dealers and
   other sources, as required. Equity securities that have traded on an exchange
   are valued at the last sale price on the principal exchange where they are
   traded. Equity securities that have not traded on the date of valuation, or
   securities for which sale prices are not available, generally are valued
   using the mean between the last bid and asked prices. The values of interest
   rate swaps are determined by obtaining dealer quotations. Securities for
   which independent pricing services are unable to supply prices or for which
   market prices and/or quotations are not readily available or are considered
   to be unreliable are valued using fair value methods pursuant to procedures
   adopted by the Board of Trustees.

   The Trust may use fair value methods if it is determined that a significant
   event has occurred after the close of the exchange or market on which the
   security trades and prior to the determination of the Trust's net asset
   value. Thus, the valuation of the Trust's securities may differ from exchange
   prices.

   At April 30, 2011, there were no securities that were valued using fair value
   methods (other than securities valued using prices supplied by independent
   pricing services). Inputs used when applying fair value methods to value a
   security may include credit ratings, the financial condition of the company,
   current market conditions and comparable securities. Short-term fixed income
   securities with remaining maturities of sixty days or less are generally
   valued at amortized cost. Money market mutual funds are valued at net asset
   value.

   Discount and premium on debt securities are accreted or amortized,
   respectively, daily into interest income on a yield-to-maturity basis with a
   corresponding increase or decrease in the cost basis of the security.
   Interest income, including interest-bearing cash accounts, is recorded on an
   accrual basis.

   Dividend income is recorded on the ex-dividend date, except that certain
   dividends from foreign securities where the ex-dividend date may have passed
   are recorded as soon as the Trust becomes aware of the ex-dividend data in
   the exercise of reasonable diligence.

   Gains and losses on sales of investments are calculated on the identified
   cost method for both financial reporting and federal income tax purposes.


28     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


B. Federal Income Taxes

   It is the Trust's policy to comply with the requirements of the Internal
   Revenue Code applicable to regulated investment companies and to distribute
   all of its taxable income and net realized capital gains, if any, to its
   shareowners. Therefore, no federal income tax provision is required. Tax
   years for the prior three fiscal years remain subject to examination by tax
   authorities.

   The amounts and characterizations of distributions to shareowners for
   financial reporting purposes are determined in accordance with federal income
   tax rules. Therefore, the sources of the Trust's distributions may be shown
   in the accompanying financial statements as from or in excess of net
   investment income or as from net realized gain (loss) on investment
   transactions, or as from paid in-capital, depending on the type of book/tax
   differences that may exist.

   At April 30, 2011, the Trust reclassified $368,138 to decrease undistributed
   net investment income and to decrease net realized loss on investments to
   reflect permanent book/tax differences. The reclassification has no impact on
   the net assets of the Trust and presents the Trust's capital accounts on a
   tax basis.

   At April 30, 2011, the Trust had a net capital loss carryforward of
   $23,146,406, of which the following amounts will expire between 2014 and 2018
   if not utilized: $5,441,357 in 2014, $4,138,756 in 2015, $4,586,154 in 2017,
   and $8,980,139 in 2018.

   The Trust has elected to defer approximately $1,242,549 of capital losses
   recognized between November 1, 2010 and April 30, 2011 to its fiscal year
   ending April 30, 2012.

   The tax character of distributions paid to common and preferred shareowners
   during the years ended April 30, 2011 and April 30, 2010 was as follows:



   ---------------------------------------------------------------------------
                                                          2011            2010
   ---------------------------------------------------------------------------
                                                             
   Distributions paid from:
   Tax exempt income                              $24,122,149      $21,528,535
   Ordinary income                                     62,382          456,870
   ---------------------------------------------------------------------------
     Total                                        $24,184,531      $21,985,405
   ===========================================================================



            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     29


   The following shows the components of distributable earnings (losses) on a
   federal income tax basis at April 30, 2011.



   ---------------------------------------------------------------------------
                                                                         2011
   ---------------------------------------------------------------------------
                                                             
   Distributable earnings:
   Undistributed tax-exempt income                              $  10,781,502
   Undistributed ordinary income                                       38,991
   Capital loss carryforward                                      (23,146,406)
   Post-October loss deferred                                      (1,242,549)
   Dividend payable                                                    (3,894)
   Unrealized depreciation                                        (14,038,101)
   ---------------------------------------------------------------------------
     Total                                                      $ (27,610,457)
   ===========================================================================


   The difference between book-basis and tax-basis unrealized depreciation is
   primarily attributable to the difference between book and tax amortization
   methods for premiums and discounts on fixed income securities, book/tax
   difference in the accrual of income on securities in default, the deferral of
   post-October capital losses for tax purposes and other temporary differences.

C. Automatic Dividend Reinvestment Plan

   All common shareowners whose shares are registered in their own names
   automatically participate in the Automatic Dividend Reinvestment Plan (the
   Plan), under which participants receive all dividends and capital gain
   distributions (collectively, dividends) in full and fractional common shares
   of the Trust in lieu of cash. Shareowners may elect not to participate in the
   Plan. Shareowners not participating in the Plan receive all dividends and
   capital gain distributions in cash. Participation in the Plan is completely
   voluntary and may be terminated or resumed at any time without penalty by
   notifying American Stock Transfer & Trust Company, the agent for shareowners
   in administering the Plan (the Plan Agent), in writing prior to any dividend
   record date; otherwise such termination or resumption will be effective with
   respect to any subsequently declared dividend or other distribution.

   If a shareowner's shares are held in the name of a brokerage firm, bank or
   other nominee, the shareowner can ask the firm or nominee to participate in
   the Plan on the shareowner's behalf. If the firm or nominee does not offer
   the Plan, dividends will be paid in cash to the shareowner of record. A firm
   or nominee may reinvest a shareowner's cash dividends in common shares of the
   Trust on terms that differ from the terms of the Plan.

   Whenever the Trust declares a dividend on common shares payable in cash,
   participants in the Plan will receive the equivalent in common shares
   acquired by the Plan Agent either (i) through receipt of additional unissued
   but authorized common shares from the Trust or (ii) by purchase of
   outstanding common shares on the New York Stock Exchange or elsewhere. If, on
   the payment date for any dividend, the net asset value per common share


30     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


   is equal to or less than the market price per share plus estimated brokerage
   trading fees (market premium), the Plan Agent will invest the dividend amount
   in newly issued common shares. The number of newly issued common shares to be
   credited to each account will be determined by dividing the dollar amount of
   the dividend by the net asset value per common share on the date the shares
   are issued, provided that the maximum discount from the then current market
   price per share on the date of issuance does not exceed 5%. If, on the
   payment date for any dividend, the net asset value per common share is
   greater than the market value (market discount), the Plan Agent will invest
   the dividend amount in common shares acquired in open-market purchases. There
   are no brokerage charges with respect to newly issued common shares. However,
   each participant will pay a pro rata share of brokerage trading fees incurred
   with respect to the Plan Agent's open-market purchases. Participating in the
   Plan does not relieve shareowners from any federal, state or local taxes
   which may be due on dividends paid in any taxable year. Shareowners holding
   Plan shares in a brokerage account may not be able to transfer the shares to
   another broker and continue to participate in the Plan.

2. Management Agreement

Pioneer Investment Management, Inc. (PIM), the Trust's investment adviser, a
wholly owned indirect subsidiary of UniCredit S.p.A. (UniCredit), manages the
Trust's portfolio. Management fees payable under the Trust's Advisory Agreement
with PIM are calculated daily at the annual rate of 0.60% of the Trust's
average daily managed assets. "Managed assets" means (a) the total assets of
the Trust, including any form of investment leverage, minus (b) all accrued
liabilities incurred in the normal course of operations, which shall not
include any liabilities or obligations attributable to investment leverage
obtained through (i) indebtedness of any type (including, without limitation,
borrowing through a credit facility or the issuance of debt securities), (ii)
the issuance of preferred stock or other similar preference securities, and/or
(iii) any other means. For the year ended April 30, 2011 the net management fee
was 0.60% of the Trust's average daily managed assets, which was equivalent to
0.80% of the Trust's average daily net assets attributable to the common
shareowners.

In addition, under PIM's management and administration agreements, certain
other services and costs are paid by PIM and reimbursed by the Trust. At April
30, 2011, $198,552 was payable to PIM related to management costs,
administrative costs and certain other reimbursements and is included in "Due
to affiliates" on the Statement of Assets and Liabilities.

Effective September 1, 2010, PIM has retained State Street Bank and Trust
Company (State Street) to provide certain administrative and accounting
services to the Trust on its behalf. For such services, PIM pays State Street a
monthly fee at an annual rate of 0.07% of the Trust's average daily managed


            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     31


assets up to $500 million and 0.03% for average daily managed assets in excess
of $500 million, subject to a minimum monthly fee of $10,000. Previously, PIM
had retained Princeton Administrators, LLC (Princeton) to provide such
services. PIM paid Princeton a monthly fee at an annual rate of 0.07% of the
Trust's average daily managed assets up to $500 million and 0.03% for average
daily managed assets in excess of $500 million, subject to a minimum monthly
fee of $10,000. Neither State Street nor Princeton received compensation
directly from the Trust for providing such services.

3. Transfer Agents

Pioneer Investment Management Shareholder Services, Inc. (PIMSS), a wholly
owned indirect subsidiary of UniCredit, through a sub-transfer agency agreement
with American Stock Transfer & Trust Company, provides substantially all
transfer agent and shareowner services related to the Trust's common shares at
negotiated rates. Deutsche Bank Trust Company Americas (Deutsche Bank) is the
transfer agent, registrar, dividend paying agent and auction agent with respect
to the Trust's Auction Preferred Shares (APS). The Trust pays Deutsche Bank an
annual fee, as is agreed to from time to time by the Trust and Deutsche Bank,
for providing such services.

In addition, the Trust reimburses PIMSS for out-of-pocket expenses incurred by
PIMSS related to shareholder communications activities such as proxy and
statement mailings and outgoing phone calls.

4. Interest Rate Swaps

The Trust may enter into interest rate swap transactions to attempt to protect
itself from increasing dividend or interest expense on its leverage resulting
from increasing short-term interest rates. The cost of leverage may rise with
an increase in interest rates, generally having the effect of lower yields and
potentially lower dividends to common shareowners. Interest rate swaps can be
used to "lock in" the cost of leverage and reduce the negative impact that
rising short-term interest rates would have on the Trust's leveraging costs.

An interest rate swap is an agreement between two parties, which involves
exchanging floating rate and fixed rate interest payments for a specified
period of time. Interest rate swaps involve the accrual of the net interest
payments between the parties on a daily basis, with the net amount recorded
within the unrealized appreciation/depreciation of interest rate swaps on the
Statement of Assets and Liabilities. Once the interim payments are settled in
cash, at the pre-determined dates specified in the agreement, the net amount is
recorded as realized gain or loss from interest rate swaps on the Statement of
Operations. During the term of the swap, changes in the value of the swap are
recognized as unrealized gains and losses by "marking-to-market" the value of
the swap based on values obtained from dealer quotations. When the swap is
terminated, the Trust will record a realized gain or loss equal to the
difference, if any,


32     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


between the proceeds from (or cost of) closing the contract and the cost basis
of the contract. The Trust is exposed to credit risk in the event of non-
performance by the other party to the interest rate swap. Risk may also arise
with regard to market movements in the value of the swap arrangement that do
not exactly offset the changes in the related dividend requirement or interest
expense on the Trust's leverage.

There were no interest rate swap contracts outstanding at April 30, 2011.

5. Trust Shares

There are an unlimited number of common shares of beneficial interest
authorized.

Transactions in common shares of beneficial interest for the years ended April
30, 2011 and April 30, 2010 were as follows:



------------------------------------------------------------------------------
                                                     4/30/11          4/30/10
------------------------------------------------------------------------------
                                                             
Shares outstanding at beginning of year           22,251,232       22,140,525
Reinvestment of distributions                        130,191          110,707
------------------------------------------------------------------------------
Shares outstanding at end of year                 22,381,423       22,251,232
==============================================================================


The Trust may classify or reclassify any unissued shares of beneficial interest
into one or more series of preferred shares of beneficial interest. As of April
30, 2011, there were 4,040 APS as follows: Series A-2,000 and Series B-2,040.

Dividends on Series A and Series B are cumulative at a rate which is to be
reset every seven days based on the results of an auction. An auction fails if
there are more APS offered for sale than there are buyers. When an auction
fails, the dividend rate for the period will be the maximum rate on the auction
dates described in the prospectus for the APS. Preferred shareowners are not
able to sell their APS at an auction if the auction fails. Since February 2008,
the Trust's auctions related to the APS have failed. The maximum rate for each
Series is 110% of the 7 day commercial rate or Kenny rate. Dividend rates on
APS ranged from 0.319% to 0.503% during the year ended April 30, 2011.

The Trust may not declare dividends or make other distributions on its common
shares or purchase any such shares if, at the time of the declaration,
distribution or purchase, the Trust does not comply with the asset coverage
ratios described in the prospectus for the APS.

The APS are redeemable at the option of the Trust, in whole or in part, on any
dividend payment date at $25,000 per share plus any accumulated or unpaid
dividends, whether or not declared. The APS are also subject to mandatory
redemption at $25,000 per share plus any accumulated or unpaid dividends,
whether or not declared, if certain requirements relating to the composition of
the assets and liabilities of the Trust as set forth in the Statement of
Preferences are not satisfied.


            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     33


The holders of APS have voting rights equal to the holders of the Trust's
common shares (one vote per share) and will vote together with holders of the
common shares as a single class. Holders of APS are also entitled to elect two
of the Trust's Trustees. In addition, the Investment Company Act of 1940, as
amended, requires that along with approval by shareowners that might otherwise
be required, the approval of the holders of a majority of any outstanding
preferred shares, voting separately as a class, would be required to (a) adopt
any plan of reorganization that would adversely affect the preferred shares and
(b) take any action requiring a vote of security holders, including, among
other things, changes in the Trust's subclassification as a closed-end
management investment company or changes in its fundamental investment
restrictions.

6. Subsequent Events

The Board of Trustees of the Trust declared on May 6, 2011 a dividend from
undistributed net investment income of $0.095 per common share payable on May
31, 2011 to shareowners of record.

Subsequent to April 30, 2011, dividends declared and paid on preferred shares
totaled $36,436 in aggregate for the two outstanding preferred share series
through June 16, 2011.

In preparing these financial statements, PIM has evaluated the impact of all
events and transactions for potential recognition or disclosure and has
determined that other than disclosed above, there were no subsequent events
requiring recognition or disclosure in the financial statements.


34     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


Report of Independent Registered Public Accounting Firm

To the Board of Trustees and the Shareowners of
Pioneer Municipal High Income Trust:
--------------------------------------------------------------------------------
We have audited the accompanying statement of assets and liabilities of Pioneer
Municipal High Income Trust (the "Trust"), including the schedule of
investments, as of April 30, 2011, and the related statement of operations for
the year then ended, the statements of changes in net assets for each of the
two years in the period then ended, and the financial highlights for each of
the five years in the period then ended. These financial statements and
financial highlights are the responsibility of the Trust's management. Our
responsibility is to express an opinion on these financial statements and
financial highlights based on our audits.

We conducted our audits in accordance with the standards of the Public Company
Accounting Oversight Board (United States). Those standards require that we
plan and perform the audit to obtain reasonable assurance about whether the
financial statements and financial highlights are free of material
misstatement. We were not engaged to perform an audit of the Trust's internal
control over financial reporting. Our audits included consideration of internal
control over financial reporting as a basis for designing audit procedures that
are appropriate in the circumstances, but not for the purpose of expressing an
opinion on the effectiveness of the Trust's internal control over financial
reporting. Accordingly, we express no such opinion. An audit also includes
examining, on a test basis, evidence supporting the amounts and disclosures in
the financial statements and financial highlights, assessing the accounting
principles used and significant estimates made by management, and evaluating
the overall financial statement presentation. Our procedures included
confirmation of securities owned as of April 30, 2011, by correspondence with
the custodian and brokers or by other appropriate auditing procedures where
replies from brokers were not received. We believe that our audits provide a
reasonable basis for our opinion.

In our opinion, the financial statements and financial highlights referred to
above present fairly, in all material respects, the financial position of
Pioneer Municipal High Income Trust at April 30, 2011, the results of its
operations for the year then ended, the changes in its net assets for each of
the two years in the period then ended, and the financial highlights for each
of the five years in the period then ended, in conformity with U.S. generally
accepted accounting principles.

                                                     Ernst & Young LLP

Boston, Massachusetts
June 24, 2011


            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     35


ADDITIONAL INFORMATION (unaudited)

During the period, there have been no material changes in the Trust's
investment objective or fundamental policies that have not been approved by the
shareowners. There have been no changes in the Trust's charter or By-Laws that
would delay or prevent a change in control of the Trust which has not been
approved by the shareowners. There have been no changes in the principal risk
factors associated with investment in the Trust. There were no changes in the
persons who are primarily responsible for the day-to-day management of the
Trust's portfolio.

Notice is hereby given in accordance with Section 23(c) of the Investment
Company Act of 1940 that the Trust may purchase, from time to time, its common
shares in the open market.

IMPORTANT TAX INFORMATION (unaudited)

The following summarizes the taxable per share distributions paid by Pioneer
Municipal High Income Trust during the taxable year ended April 30, 2011:



--------------------------------------------------------------------------------
                                                    Payable          Ordinary
                                                    Date             Income
--------------------------------------------------------------------------------
                                                               
 Common Shareowners                                 12/20/2010       $ 0.00274
 Preferred Shareowners
  Series A                                          12/22/2011       $ 0.26900
  Series B                                          12/23/2011       $0.270098


All of the other net investment income distributions paid by the Trust qualify
as tax-exempt interest dividends for Federal income tax purposes.


36     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


Approval of Investment Advisory Agreement

Pioneer Investment Management, Inc. (PIM) serves as the investment adviser to
Pioneer Municipal High Income Trust (the Trust) pursuant to an investment
advisory agreement between PIM and the Trust. In order for PIM to remain the
investment adviser of the Trust, the Trustees of the Trust must determine
annually whether to renew the investment advisory agreement for the Trust.

The contract review process began in March 2010 as the Trustees of the Trust
agreed on, among other things, an overall approach and timeline for the
process. In July 2010, the Trustees approved the format of the contract review
materials and submitted their formal request to PIM to furnish information
necessary to evaluate the terms of the investment advisory agreement. The
contract review materials were provided to the Trustees in July 2010 and
September 2010. After reviewing and discussing the materials, the Trustees
submitted a request for additional information to PIM, and materials were
provided in response to this request. Meetings of the Independent Trustees of
the Trust were held in July, September, October, and November, 2010 to review
and discuss the contract review materials. In addition, the Trustees took into
account the information related to the Trust provided to the Trustees at each
regularly scheduled meeting.

At a meeting held on November 16, 2010, based on their evaluation of the
information provided by PIM and third parties, the Trustees of the Trust,
including the Independent Trustees voting separately, unanimously approved the
renewal of the investment advisory agreement for another year. In considering
the renewal of the investment advisory agreement, the Trustees considered
various factors that they determined were relevant, including the factors
described below. The Trustees did not identify any single factor as the
controlling factor in determining to approve the renewal of the agreement.

Nature, Extent and Quality of Services
The Trustees considered the nature, extent and quality of the services that had
been provided by PIM to the Trust, taking into account the investment objective
and strategy of the Trust. The Trustees reviewed the terms of the investment
advisory agreement. The Trustees also reviewed PIM's investment approach for
the Trust, its research process and its process for trade execution. The
Trustees considered the resources of PIM and the personnel of PIM who provide
investment management services to the Trust. The Trustees considered the
non-investment resources and personnel of PIM involved in PIM's services to the
Trust, including PIM's compliance and legal resources and personnel. In
addition, the Trustees considered the arrangements put in place to retain key
investment and other personnel. The Trustees also considered the substantial


            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     37


attention and high priority given by PIM's senior management to the Pioneer
fund complex.

The Trustees considered that PIM supervises and monitors the performance of the
Trust's service providers and provides the Trust with personnel (including
Trust officers) and other resources that are necessary for the Trust's business
management and operations. The Trustees also considered that, as administrator,
PIM is responsible for the administration of the Trust's business and other
affairs. The Trustees considered the fees paid to PIM for the provision of
administration services.

Based on these considerations, the Trustees concluded that the nature, extent
and quality of services that had been provided by PIM to the Trust were
satisfactory and consistent with the terms of the investment advisory
agreement.

Performance of the Trust
The Trustees considered the performance results of the Trust over various time
periods. They reviewed information comparing the Trust's performance with the
performance of its peer group of funds as classified by Morningstar, Inc.
(Morningstar), an independent provider of investment company data, and with the
performance of the Trust's benchmark index. The Trustees considered that the
Trust's annualized total return was in the first quintile of its Morningstar
category for the one year period ended June 30, 2010, in the second quintile of
its Morningstar category for the three year period ended June 30, 2010, and in
the third quintile of its Morningstar category for the five year period ended
June 30, 2010. (In all quintile rankings referred to throughout this
disclosure, first quintile is most favorable to the Trust's shareowners. Thus,
highest relative performance would be first quintile and lowest relative
expenses would also be first quintile.) The Trustees noted that the yield of
the Trust compared favorably to the yield of the Trust's benchmarks as of June
30, 2010. The Trustees reviewed data provided by PIM showing how leverage had
benefited the Trust's common shareholders. The Trustees concluded that the
investment performance of the Trust was satisfactory.

Management Fee and Expenses
The Trustees considered information on the fees and expenses of the Trust in
comparison to the management fees and the expense ratios of a peer group of
funds selected on the basis of criteria determined by the Independent Trustees
for this purpose using data provided by Strategic Insight Mutual Fund Research
and Consulting, LLC (Strategic Insight), an independent third party.

The Trustees considered that the Trust's management fee rate based on common
shares assets for the twelve months ended June 30, 2010 was in the second
quintile relative to the management fees paid by other funds in its Strategic
Insight peer group for the comparable period. The Trustees considered that the


38     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


Trust's expense ratio for the twelve months ended June 30, 2010 was in the
second quintile relative to its Strategic Insight peer group for the comparable
period.

The Trustees also reviewed management fees charged by PIM to its institutional
and other clients. In evaluating the fees associated with PIM's client
accounts, the Trustees took into account the respective demands, resources and
complexity associated with the Trust and client accounts. The Trustees noted
that in some instances the fee rates for those clients were lower than the
management fee for the Trust and considered that, under the investment advisory
agreement with the Trust, PIM performs additional services for the Trust that
it does not provide to those other clients or services that are broader in
scope, including oversight of the Trust's other service providers and
activities related to compliance and the extensive regulatory and tax regimes
to which the Trust is subject. The Trustees concluded that the management fee
payable by the Trust to PIM was reasonable in relation to the nature and
quality of the services provided by PIM.

Profitability
The Trustees considered information provided by PIM regarding the profitability
of PIM with respect to the advisory services provided by PIM to the Trust,
including the methodology used by PIM in allocating certain of its costs to the
management of the Trust. The Trustees also considered PIM's profit margin in
connection with the overall operation of the Trust. They further reviewed the
financial results realized by PIM and its affiliates from non-fund businesses.
The Trustees considered PIM's profit margins with respect to the Trust in
comparison to the limited industry data available and noted that the
profitability of any adviser was affected by numerous factors, including its
organizational structure and method for allocating expenses. The Trustees
concluded that PIM's profitability with respect to the management of the Trust
was not unreasonable.

Economies of Scale
The Trustees considered the extent to which PIM may realize economies of scale
or other efficiencies in managing and supporting the Trust. Since the Trust is
a closed-end fund that has not raised additional capital, the Trustees
concluded that economies of scale were not a relevant consideration in the
renewal of the investment advisory agreement.

Other Benefits
The Trustees considered the other benefits to PIM from its relationship with
the Trust. The Trustees considered the character and amount of fees paid by the
Trust, other than under the investment advisory agreement, for services
provided by PIM and its affiliates. The Trustees further considered the
revenues and profitability of PIM's businesses other than the fund business.
The Trustees considered the intangible benefits to PIM by virtue of its
relationship with the


            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     39


Trust and the other Pioneer funds. The Trustees concluded that the receipt of
these benefits was reasonable in the context of the overall relationship
between PIM and the Trust.

Conclusion
After consideration of the factors described above as well as other factors,
the Trustees, including all of the Independent Trustees, concluded that the
investment advisory agreement between PIM and the Trust, including the fees
payable thereunder, was fair and reasonable and voted to approve the proposed
renewal of the investment advisory agreement for the Trust.


40     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


Trustees, Officers and Service Providers

Investment Adviser
Pioneer Investment Management, Inc.

Custodian
Brown Brothers Harriman & Co.

Independent Registered Public Accounting Firm
Ernst & Young LLP

Legal Counsel
Bingham McCutchen LLP

Transfer Agent
Pioneer Investment Management Shareholder Services, Inc.

Shareowner Services and Sub-Transfer Agent
American Stock Transfer & Trust Company

Preferred Share Auction/Transfer Agent and Registrar
Deutsche Bank Trust Company Americas

Sub-Administrator
State Street Bank and Trust Company

Proxy Voting Policies and Procedures of the Trust are available without charge,
upon request, by calling our toll free number (1-800-225-6292). Information
regarding how the Trust voted proxies relating to portfolio securities during
the most recent 12-month period ended June 30 is publicly available to
shareowners at www.pioneerinvestments.com. This information is also available
on the Securities and Exchange Commission's web site at http://www.sec.gov.

Trustees and Officers

The Trust's Trustees and officers are listed on the following pages, together
with their principal occupations during at least the past five years. Trustees
who are interested persons of the Trust within the meaning of the 1940 Act are
referred to as Interested Trustees. Trustees who are not interested persons of
the Trust are referred to as Independent Trustees. Each of the Trustees, except
Mr. West, serves as a trustee of each of the 56 U.S. registered investment
portfolios for which Pioneer serves as investment adviser (the "Pioneer
Funds"). Mr. West serves as a trustee of 44 U.S. registered investment
portfolios for which Pioneer serves as investment adviser. The address for all
Trustees and all officers of the Trust is 60 State Street, Boston,
Massachusetts 02109.

The Statement of Additional Information of the Trust includes additional
information about the Trustees and is available, without charge, upon request,
by calling 1-800-225-6292.


            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     41


Interested Trustees



--------------------------------------------------------------------------------
                            Position Held            Length of Service
Name and Age                With the Trust           and Term of Office
--------------------------------------------------------------------------------
                                               
John F. Cogan, Jr. (84)*    Chairman of the Board,   Class I Trustee since
                            Trustee and President    2003. Term expires in
                                                     2013. Elected by Pre-
                                                     ferred Shares only.
--------------------------------------------------------------------------------
Daniel K. Kingsbury (52)*   Trustee and Executive    Class II Trustee since
                            Vice President           2007. Term expires in
                                                     2011.
--------------------------------------------------------------------------------

Interested Trustees


----------------------------------------------------------------------------------------------------------------------
                                                                                                 Other Directorships
Name and Age                Principal Occupation                                                 Held by this Trustee
----------------------------------------------------------------------------------------------------------------------
                                                                                           
John F. Cogan, Jr. (84)*    Non-Executive Chairman and a director of Pioneer Investment          None
                            Management USA Inc. ("PIM-USA"); Chairman and a director of
                            Pioneer; Chairman and Director of Pioneer Institutional Asset
                            Management, Inc. (since 2006); Director of Pioneer Alternative
                            Investment Management Limited (Dublin); President and a direc-
                            tor of Pioneer Alternative Investment Management (Bermuda)
                            Limited and affiliated funds; Deputy Chairman and a director of
                            Pioneer Global Asset Management S.p.A. ("PGAM") (until April
                            2010); Director of PIOGLOBAL Real Estate Investment Fund (Rus-
                            sia) (until June 2006); Director of Nano-C, Inc. (since 2003);
                            Director of Cole Management Inc. (since 2004); Director of Fidu-
                            ciary Counseling, Inc.; President and Director of Pioneer Funds
                            Distributor, Inc. ("PFD") (until May 2006); President of all of the
                            Pioneer Funds; and Of Counsel, Wilmer Cutler Pickering Hale and
                            Dorr LLP
----------------------------------------------------------------------------------------------------------------------
Daniel K. Kingsbury (52)*   Director, CEO and President of PIM-USA (since February 2007);        None
                            Director and President of Pioneer and Pioneer Institutional Asset
                            Management, Inc. (since February 2007); Executive Vice Presi-
                            dent of all of the Pioneer Funds (since March 2007); Director of
                            PGAM (2007 - 2010); Head of New Europe Division, PGAM
                            (2000 - 2005); and Head of New Markets Division, PGAM
                            (2005 - 2007)
----------------------------------------------------------------------------------------------------------------------


* Mr. Cogan and Mr. Kingsbury are Interested Trustees because they are officers
  or directors of the Trust's investment adviser and certain of its affiliates.

42    Pioneer Municipal High Income Trust | Annual Report | 4/30/11


Independent Trustees



--------------------------------------------------------------------------------
                     Position Held          Length of Service
Name and Age         With the Trust         and Term of Office
--------------------------------------------------------------------------------
                                      
David R. Bock (67)   Trustee               Class I Trustee since 2005.
                                           Term expires in 2013.
--------------------------------------------------------------------------------
Mary K. Bush (63)    Trustee               Class III Trustee since 2003.
                                           Term expires in 2012.

Independent Trustees


---------------------------------------------------------------------------------------------------------------------------
                                                                                            Other Directorships
Name and Age         Principal Occupation                                                   Held by this Trustee
---------------------------------------------------------------------------------------------------------------------------
                                                                                      
David R. Bock (67)   Managing Partner, Federal City Capital Advisors (corporate advi-       Director of Enterprise Com-
                     sory services company) (1997 - 2004 and 2008 - present);               munity Investment, Inc.
                     Interim Chief Executive Officer, Oxford Analytica, Inc. (privately     (privately held affordable
                     held research and consulting company) (2010); Executive Vice           housing finance company)
                     President and Chief Financial Officer, I-trax, Inc. (publicly traded   (1985 - 2010); Director of
                     health care services company) (2004 - 2007); and Executive             Oxford Analytica, Inc. (2008
                     Vice President and Chief Financial Officer, Pedestal Inc. (internet-   - present); Director of The
                     based mortgage trading company) (2000 - 2002)                          Swiss Helvetia Fund, Inc.
                                                                                            (closed-end fund) (2010 -
                                                                                            present); and Director of
                                                                                            New York Mortgage Trust
                                                                                            (publicly traded mortgage
                                                                                            REIT) (2004 - 2009)
---------------------------------------------------------------------------------------------------------------------------
Mary K. Bush (63)    Chairman, Bush International, LLC (international financial advi-       Director of Marriott Interna-
                     sory firm) (1991 - present); Senior Managing Director, Brock           tional, Inc. (2008 -
                     Capital Group, LLC (strategic business advisors) (2010 -               present); Director of Dis-
                     present); Managing Director, Federal Housing Finance Board             cover Financial Services
                     (oversight of Federal Home Loan Bank system) (1989 - 1991);            (credit card issuer and elec-
                     Vice President and Head of International Finance, Federal              tronic payment services)
                     National Mortgage Association (1988 - 1989); U.S. Alternate            (2007 - present); Former
                     Executive Director, International Monetary Fund (1984 - 1988);         Director of Briggs & Stratton
                     Executive Assistant to Deputy Secretary of the U.S. Treasury,          Co. (engine manufacturer)
                     U.S. Treasury Department (1982 - 1984); and Vice President             (2004 - 2009); Former
                     and Team Leader in Corporate Banking, Bankers Trust Co.                Director of UAL Corporation
                     (1976 - 1982)                                                          (airline holding company)


             Pioneer Municipal High Income Trust | Annual Report | 4/30/11    43


Independent Trustees (continued)



------------------------------------------------------------------------------------------------------------------------
                           Position Held    Length of Service                            Other Directorships
Name and Age               With the Trust   and Term of Office   Principal Occupation    Held by this Trustee
------------------------------------------------------------------------------------------------------------------------
                                                                             
Mary K. Bush (continued)                                                                 (2006 - 2010); Director of
                                                                                         ManTech International Cor-
                                                                                         poration (national security,
                                                                                         defense, and intelligence
                                                                                         technology firm) (2006 -
                                                                                         present); Member, Board of
                                                                                         Governors, Investment Com-
                                                                                         pany Institute (2007 -
                                                                                         present); Member, Board of
                                                                                         Governors, Independent
                                                                                         Directors Council (2007 -
                                                                                         present); Former Director of
                                                                                         Brady Corporation (2000 -
                                                                                         2007); Former Director of
                                                                                         Mortgage Guaranty Insur-
                                                                                         ance Corporation (1991 -
                                                                                         2006); Former Director of
                                                                                         Millennium Chemicals, Inc.
                                                                                         (commodity chemicals)
                                                                                         (2002 - 2005); Former
                                                                                         Director, R.J. Reynolds
                                                                                         Tobacco Holdings, Inc.
                                                                                         (tobacco) (1999 - 2005);
                                                                                         and Former Director of
                                                                                         Texaco, Inc. (1997 - 2001)
------------------------------------------------------------------------------------------------------------------------


44    Pioneer Municipal High Income Trust | Annual Report | 4/30/11




--------------------------------------------------------------------------------
                                Position Held        Length of Service
Name and Age                    With the Trust       and Term of Office
--------------------------------------------------------------------------------
                                               
Benjamin M. Friedman (66)       Trustee              Class II Trustee since
                                                     2008. Term expires in
                                                     2011.
--------------------------------------------------------------------------------
Margaret B.W. Graham (63)       Trustee              Class II Trustee since
                                                     2003. Term expires in
                                                     2011.
--------------------------------------------------------------------------------
Thomas J. Perna (60)            Trustee              Class III Trustee since
                                                     2006. Term expires in
                                                     2012.
--------------------------------------------------------------------------------
Marguerite A. Piret (62)        Trustee              Class III Trustee since
                                                     2003. Term expires in
                                                     2012. Elected by Pre-
                                                     ferred Shares only.
--------------------------------------------------------------------------------


------------------------------------------------------------------------------------------------------------------------------
                                                                                               Other Directorships
Name and Age                Principal Occupation                                               Held by this Trustee
------------------------------------------------------------------------------------------------------------------------------
                                                                                         
Benjamin M. Friedman (66)   William Joseph Maier Professor of Political Economy, Harvard       Trustee, Mellon Institutional
                            University (1972 - present)                                        Funds Investment Trust and
                                                                                               Mellon Institutional Funds
                                                                                               Master Portfolio (oversaw
                                                                                               17 portfolios in fund com-
                                                                                               plex) (1989 - 2008)
------------------------------------------------------------------------------------------------------------------------------
Margaret B.W. Graham (63)   Founding Director, Vice President and Corporate Secretary, The     None
                            Winthrop Group, Inc. (consulting firm) (1982 - present);
                            Desautels Faculty of Management, McGill University (1999 -
                            present); and Manager of Research Operations and Organiza-
                            tional Learning, Xerox PARC, Xerox's Advance Research Center
                            (1990 - 1994)
------------------------------------------------------------------------------------------------------------------------------
Thomas J. Perna (60)        Chairman and Chief Executive Officer, Quadriserv, Inc. (technol-   Director, Broadridge Finan-
                            ogy products for securities lending industry) (2008 - present);    cial Solutions, Inc. (investor
                            private investor (2004 - 2008); and Senior Executive Vice Presi-   communications and securi-
                            dent, The Bank of New York (financial and securities services)     ties processing provider for
                            (1986 - 2004)                                                      financial services industry)
                                                                                               (2009 - present); and
                                                                                               Director, Quadriserv, Inc.
                                                                                               (2005 - present)
------------------------------------------------------------------------------------------------------------------------------
Marguerite A. Piret (62)    President and Chief Executive Officer, Newbury, Piret & Company,   Director of New America
                            Inc. (investment banking firm) (1981 - present)                    High Income Fund, Inc.
                                                                                               (closed-end investment
                                                                                               company) (2004 - present);
                                                                                               and member, Board of Gov-
                                                                                               ernors, Investment Company
                                                                                               Institute (2000 - 2006)
------------------------------------------------------------------------------------------------------------------------------


             Pioneer Municipal High Income Trust | Annual Report | 4/30/11    45


Independent Trustees (continued)



--------------------------------------------------------------------------------
                              Position Held         Length of Service
Name and Age                  With the Trust        and Term of Office
--------------------------------------------------------------------------------
                                              
Stephen K. West (82)          Trustee               Class I Trustee since
                                                    2003. Term expires in
                                                    2013.
--------------------------------------------------------------------------------


----------------------------------------------------------------------------------------------------------------------
                                                                                        Other Directorships
Name and Age           Principal Occupation                                             Held by this Trustee
----------------------------------------------------------------------------------------------------------------------
                                                                                  
Stephen K. West (82)   Senior Counsel, Sullivan & Cromwell LLP (law firm) (1998 -       Director, The Swiss Helvetia
                       present); and Partner, Sullivan & Cromwell LLP (prior to 1998)   Fund, Inc. (closed-end
                                                                                        investment company); and
                                                                                        Director, AMVESCAP, PLC
                                                                                        (investment manager)
                                                                                        (1997 - 2005)
----------------------------------------------------------------------------------------------------------------------



46    Pioneer Municipal High Income Trust | Annual Report | 4/30/11


Trust Officers



--------------------------------------------------------------------------------
                             Position Held         Length of Service
Name and Age                 with the Trust        and Term of Office
--------------------------------------------------------------------------------
                                             
Christopher J. Kelley (46)   Secretary             Since 2010. Serves at
                                                   the discretion of the
                                                   Board.
--------------------------------------------------------------------------------
Carol B. Hannigan (50)       Assistant Secretary   Since 2010. Serves at
                                                   the discretion of the
                                                   Board.
--------------------------------------------------------------------------------
Thomas Reyes (48)            Assistant Secretary   Since 2010. Serves at
                                                   the discretion of the
                                                   Board.
--------------------------------------------------------------------------------
Mark E. Bradley (51)         Treasurer             Since 2008. Serves at
                                                   the discretion of the
                                                   Board.
--------------------------------------------------------------------------------
Luis I. Presutti (46)        Assistant Treasurer   Since 2003. Serves at
                                                   the discretion of the
                                                   Board.
--------------------------------------------------------------------------------
Gary Sullivan (53)           Assistant Treasurer   Since 2003. Serves at
                                                   the discretion of the
                                                   Board.
--------------------------------------------------------------------------------

Trust Officers


----------------------------------------------------------------------------------------------------------------------
                                                                                                 Other Directorships
Name and Age                 Principal Occupation                                                Held by this Officer
----------------------------------------------------------------------------------------------------------------------
                                                                                           
Christopher J. Kelley (46)   Vice President and Associate General Counsel of Pioneer since       None
                             January 2008 and Secretary of all of the Pioneer Funds since
                             June 2010; Assistant Secretary of all of the Pioneer Funds from
                             September 2003 to May 2010; and Vice President and Senior
                             Counsel of Pioneer from July 2002 to December 2007
----------------------------------------------------------------------------------------------------------------------
Carol B. Hannigan (50)       Fund Governance Director of Pioneer since December 2006 and         None
                             Assistant Secretary of all the Pioneer Funds since June 2010;
                             Manager - Fund Governance of Pioneer from December 2003 to
                             November 2006; and Senior Paralegal of Pioneer from January
                             2000 to November 2003
----------------------------------------------------------------------------------------------------------------------
Thomas Reyes (48)            Counsel of Pioneer since June 2007 and Assistant Secretary of       None
                             all the Pioneer Funds since June 2010; and Vice President and
                             Counsel at State Street Bank from October 2004 to June 2007
----------------------------------------------------------------------------------------------------------------------
Mark E. Bradley (51)         Vice President - Fund Accounting, Administration and Controller-    None
                             ship Services of Pioneer; Treasurer of all of the Pioneer Funds
                             since March 2008; Deputy Treasurer of Pioneer from March 2004
                             to February 2008; Assistant Treasurer of all of the Pioneer Funds
                             from March 2004 to February 2008; and Treasurer and Senior
                             Vice President, CDC IXIS Asset Management Services, from 2002
                             to 2003
----------------------------------------------------------------------------------------------------------------------
Luis I. Presutti (46)        Assistant Vice President - Fund Accounting, Administration and      None
                             Controllership Services of Pioneer; and Assistant Treasurer of all
                             of the Pioneer Funds
----------------------------------------------------------------------------------------------------------------------
Gary Sullivan (53)           Fund Accounting Manager - Fund Accounting, Administration and       None
                             Controllership Services of Pioneer; and Assistant Treasurer of all
                             of the Pioneer Funds
----------------------------------------------------------------------------------------------------------------------


             Pioneer Municipal High Income Trust | Annual Report | 4/30/11    47


Trust Officers (continued)



--------------------------------------------------------------------------------
                          Position Held                Length of Service
Name and Age              with the Trust               and Term of Office
--------------------------------------------------------------------------------
                                                 
David F. Johnson (31)     Assistant Treasurer          Since 2009. Serves at
                                                       the discretion of the
                                                       Board.
--------------------------------------------------------------------------------
Jean M. Bradley (58)      Chief Compliance Officer     Since 2010. Serves at
                                                       the discretion of the
                                                       Board.
--------------------------------------------------------------------------------


------------------------------------------------------------------------------------------------------------------
                                                                                            Other Directorships
Name and Age            Principal Occupation                                                Held by this Officer
------------------------------------------------------------------------------------------------------------------
                                                                                      
David F. Johnson (31)   Fund Administration Manager - Fund Accounting, Administration       None
                        and Controllership Services since November 2008; Assistant
                        Treasurer of all of the Pioneer Funds since January 2009; and
                        Client Service Manager - Institutional Investor Services at State
                        Street Bank from March 2003 to March 2007
------------------------------------------------------------------------------------------------------------------
Jean M. Bradley (58)    Chief Compliance Officer of Pioneer and of all the Pioneer Funds    None
                        since March 2010; Director of Adviser and Portfolio Compliance
                        at Pioneer since October 2005; and Senior Compliance Officer
                        for Columbia Management Advisers, Inc. from October 2003 to
                        October 2005
------------------------------------------------------------------------------------------------------------------


The outstanding capital stock of PFD, Pioneer and Pioneer Investment Management
Shareholder Services, Inc. ("PIMSS") is indirectly wholly owned by UniCredit
S.p.A. ("UniCredit"), one of the largest banking groups in Italy. Pioneer, the
Trust's investment adviser, provides investment management and financial
services to mutual funds, institutional and other clients.

48    Pioneer Municipal High Income Trust | Annual Report | 4/30/11




                           This page for your notes.





            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     49




                           This page for your notes.






50     Pioneer Municipal High Income Trust | Annual Report | 4/30/11




                           This page for your notes.





            Pioneer Municipal High Income Trust | Annual Report | 4/30/11     51




                           This page for your notes.






52     Pioneer Municipal High Income Trust | Annual Report | 4/30/11


How to Contact Pioneer

We are pleased to offer a variety of convenient ways for you to contact us for
assistance or information.

You can call American Stock Transfer & Trust Company (AST) for:
--------------------------------------------------------------------------------


                                             
Account Information                             1-800-710-0935

Or write to AST:
--------------------------------------------------------------------------------
For                                             Write to

General inquiries, lost dividend checks,        American Stock
change of address, lost stock certificates,     Transfer & Trust
stock transfer                                  Operations Center
                                                6201 15th Ave.
                                                Brooklyn, NY 11219

Dividend reinvestment plan (DRIP)               American Stock
                                                Transfer & Trust
                                                Wall Street Station
                                                P.O. Box 922
                                                New York, NY 10269-0560


Visit our web site: www.amstock.com


For additional information, please contact your investment advisor or visit our
web site www.pioneerinvestments.com.

The Trust files a complete statement of investments with the Securities and
Exchange Commission for the first and third quarters for each fiscal year on
Form N-Q. Shareowners may view the filed Form N-Q by visiting the Commission's
web site at http://www.sec.gov. The filed form also may be viewed and copied at
the Commission's Public Reference Room in Washington, DC. Information regarding
the operations of the Public Reference Room may be obtained by calling
1-800-SEC-0330.


ITEM 2. CODE OF ETHICS.

(a) Disclose whether, as of the end of the period covered by the report, the
registrant has adopted a code of ethics that applies to the registrant's
principal executive officer, principal financial officer, principal accounting
officer or controller, or persons performing similar functions, regardless of
whether these individuals are employed by the registrant or a third party.  If
the registrant has not adopted such a code of ethics, explain why it has not
done so.

The registrant has adopted, as of the end of the period covered by this report,
a code of ethics that applies to the registrant's principal executive officer,
principal financial officer, principal accounting officer and controller.

(b) For purposes of this Item, the term "code of ethics" means written standards
that are reasonably designed to deter wrongdoing and to promote:

        (1) Honest and ethical conduct, including the ethical handling of actual
        or apparent conflicts of interest between personal and professional
        relationships;

        (2) Full, fair, accurate, timely, and understandable disclosure in
        reports and documents that a registrant files with, or submits to, the
        Commission and in other public communications made by the registrant;

        (3) Compliance with applicable governmental laws, rules, and
        regulations;

        (4) The prompt internal reporting of violations of the code to an
        appropriate person or persons identified in the code; and

        (5) Accountability for adherence to the code.

(c) The registrant must briefly describe the nature of any amendment, during the
period covered by the report, to a provision of its code of ethics that applies
to the registrant's principal executive officer, principal financial officer,
principal accounting officer or controller, or persons performing similar
functions, regardless of whether these individuals are employed by the
registrant or a third party, and that relates to any element of the code of
ethics definition enumerated in paragraph (b) of this Item. The registrant must
file a copy of any such amendment as an exhibit pursuant to Item 10(a), unless
the registrant has elected to satisfy paragraph (f) of this Item by posting its
code of ethics on its website pursuant to paragraph (f)(2) of this Item, or by
undertaking to provide its code of ethics to any person without charge, upon
request, pursuant to paragraph (f)(3) of this Item.

The registrant has made no amendments to the code of ethics during the period
covered by this report.

(d) If the registrant has, during the period covered by the report, granted a
waiver, including an implicit waiver, from a provision of the code of ethics to
the registrant's principal executive officer, principal financial officer,
principal accounting officer or controller, or persons performing similar
functions, regardless of whether these individuals are employed by the
registrant or a third party, that relates to one or more of the items set forth
in paragraph (b) of this Item, the registrant must briefly describe the nature
of the waiver, the name of the person to whom the waiver was granted, and the
date of the waiver.

Not applicable.

(e) If the registrant intends to satisfy the disclosure requirement under
paragraph (c) or (d) of this Item regarding an amendment to, or a waiver from,
a provision of its code of ethics that applies to the registrant's principal
executive officer, principal financial officer, principal accounting officer or
controller, or persons performing similar functions and that relates to any
element of the code of ethics definition enumerated in paragraph (b) of this
Item by posting such information on its Internet website, disclose the
registrant's Internet address and such intention.

Not applicable.

(f) The registrant must:

        (1) File with the Commission, pursuant to Item 10(a), a copy of its code
        of ethics that applies to the registrant's principal executive officer,
        principal financial officer, principal accounting officer or controller,
        or persons performing similar functions, as an exhibit to its annual
        report on this Form N-CSR;

        (2) Post the text of such code of ethics on its Internet website and
        disclose, in its most recent report on this Form N-CSR, its Internet
        address and the fact that it has posted such code of ethics on its
        Internet website; or

        (3) Undertake in its most recent report on this Form N-CSR to provide to
        any person without charge, upon request, a copy of such code of ethics
        and explain the manner in which such request may be made.
	See Item 10(2)

ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT.

(a) (1)  Disclose that the registrant's board of trustees has determined that
         the registrant either:

    (i)  Has at least one audit committee financial expert serving on its audit
         committee; or

    (ii) Does not have an audit committee financial expert serving on its audit
         committee.

The registrant's Board of Trustees has determined that the registrant has at
least one audit committee financial expert.

    (2) If the registrant provides the disclosure required by paragraph
(a)(1)(i) of this Item, it must disclose the name of the audit committee
financial expert and whether that person is "independent." In order to be
considered "independent" for purposes of this Item, a member of an audit
committee may not, other than in his or her capacity as a member of the audit
committee, the board of trustees, or any other board committee:

    (i)  Accept directly or indirectly any consulting, advisory, or other
         compensatory fee from the issuer; or

    (ii) Be an "interested person" of the investment company as defined in
         Section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19)).

Ms. Marguerite A. Piret, an independent trustee, is such an audit committee
financial expert.

    (3) If the registrant provides the disclosure required by paragraph (a)(1)
(ii) of this Item, it must explain why it does not have an audit committee
financial expert.

Not applicable.


ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES.

(a) Disclose, under the caption AUDIT FEES, the aggregate fees billed for each
of the last two fiscal years for professional services rendered by the principal
accountant for the audit of the registrant's annual financial statements or
services that are normally provided by the accountant in connection with
statutory and regulatory filings or engagements for those fiscal years.

Audit Fees
Fees for audit services provided to the Trust, including fees
associated with the filings to update its Form N-2 and
issuance of comfort letters, totaled approximately $42,100 in
2011 and $41,600 in 2010.

(b) Disclose, under the caption AUDIT-RELATED FEES, the aggregate fees billed in
each of the last two fiscal years for assurance and related services by the
principal accountant that are reasonably related to the performance of the audit
of the registrant's financial statements and are not reported under
paragraph (a) of this Item. Registrants shall describe the nature of the
services comprising the fees disclosed under this category.

Audit-Related Fees
Audit related fees for the Trust's audit related services
totaled approximately $9,652 and $9,652 in 2011 and
2010, respectively.

(c) Disclose, under the caption TAX FEES, the aggregate fees billed in each of
the last two fiscal years for professional services rendered by the principal
accountant for tax compliance, tax advice, and tax planning. Registrants shall
describe the nature of the services comprising the fees disclosed under this
category.

Tax Fees
Fees for tax compliance services, primarily for tax returns,
totaled approximately $8,290 and $8,290 for 2011 and 2010,
respectively.

(d) Disclose, under the caption ALL OTHER FEES, the aggregate fees billed in
each of the last two fiscal years for products and services provided by the
principal accountant, other than the services reported in paragraphs (a) through
(c) of this Item. Registrants shall describe the nature of the services
comprising the fees disclosed under this category.

Other Fees
There were no other fees for 2011 and
2010.

(e) (1) Disclose the audit committee's pre-approval policies and procedures
described in paragraph (c)(7) of Rule 2-01 of Regulation S-X.

 PIONEER FUNDS
            APPROVAL OF AUDIT, AUDIT-RELATED, TAX AND OTHER SERVICES
                       PROVIDED BY THE INDEPENDENT AUDITOR

                  SECTION I - POLICY PURPOSE AND APPLICABILITY

The Pioneer Funds recognize the importance of maintaining the independence of
their outside auditors. Maintaining independence is a shared responsibility
involving Pioneer Investment Management, Inc ("PIM"), the audit committee and
the independent auditors.

The Funds recognize that a Fund's independent auditors: 1) possess knowledge of
the Funds, 2) are able to incorporate certain services into the scope of the
audit, thereby avoiding redundant work, cost and disruption of Fund personnel
and processes, and 3) have expertise that has value to the Funds. As a result,
there are situations where it is desirable to use the Fund's independent
auditors for services in addition to the annual audit and where the potential
for conflicts of interests are minimal. Consequently, this policy, which is
intended to comply with Rule 210.2-01(C)(7), sets forth guidelines and
procedures to be followed by the Funds when retaining the independent audit firm
to perform audit, audit-related tax and other services under those
circumstances, while also maintaining independence.

Approval of a service in accordance with this policy for a Fund shall also
constitute approval for any other Fund whose pre-approval is required pursuant
to Rule 210.2-01(c)(7)(ii).

In addition to the procedures set forth in this policy, any non-audit services
that may be provided consistently with Rule 210.2-01 may be approved by the
Audit Committee itself and any pre-approval that may be waived in accordance
with Rule 210.2-01(c)(7)(i)(C) is hereby waived.

Selection of a Fund's independent auditors and their compensation shall be
determined by the Audit Committee and shall not be subject to this policy.



                               SECTION II - POLICY

---------------- -------------------------------- -------------------------------------------------
SERVICE           SERVICE CATEGORY DESCRIPTION      SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES
CATEGORY
---------------- -------------------------------- -------------------------------------------------
                                            
I.  AUDIT        Services that are directly       o Accounting research assistance
SERVICES         related to performing the        o SEC consultation, registration
                 independent audit of the Funds     statements, and reporting
                                                  o Tax accrual related matters
                                                  o Implementation of new accounting
                                                    standards
                                                  o Compliance letters (e.g. rating agency
                                                    letters)
                                                  o Regulatory reviews and assistance
                                                    regarding financial matters
                                                  o Semi-annual reviews (if requested)
                                                  o Comfort letters for closed end
                                                    offerings
---------------- -------------------------------- -------------------------------------------------
II.              Services which are not           o AICPA attest and agreed-upon procedures
AUDIT-RELATED    prohibited under Rule            o Technology control assessments
SERVICES         210.2-01(C)(4) (the "Rule")      o Financial reporting control assessments
                 and are related extensions of    o Enterprise security architecture
                 the audit services support the     assessment
                 audit, or use the
                 knowledge/expertise gained
                 from the audit procedures as a
                 foundation to complete the
                 project.  In most cases, if
                 the Audit-Related Services are
                 not performed by the Audit
                 firm, the scope of the Audit
                 Services would likely
                 increase.  The Services are
                 typically well-defined and
                 governed by accounting
                 professional standards (AICPA,
                 SEC, etc.)
---------------- -------------------------------- -------------------------------------------------

 ------------------------------------- ------------------------------------
                                    
   AUDIT COMMITTEE APPROVAL POLICY               AUDIT COMMITTEE
                                                REPORTING POLICY
 ------------------------------------- ------------------------------------
                                    
 o "One-time" pre-approval             o A summary of all such
   for the audit period for all          services and related fees
   pre-approved specific service         reported at each regularly
   subcategories.  Approval of the       scheduled Audit Committee
   independent auditors as               meeting.
   auditors for a Fund shall
   constitute pre approval for
   these services.
 ------------------------------------- ------------------------------------
 o "One-time" pre-approval             o A summary of all such
   for the fund fiscal year within       services and related fees
   a specified dollar limit              (including comparison to
   for all pre-approved                  specified dollar limits)
   specific service subcategories        reported quarterly.

 o Specific approval is
   needed to exceed the
   pre-approved dollar limit for
   these services (see general
   Audit Committee approval policy
   below for details on obtaining
   specific approvals)

 o Specific approval is
   needed to use the Fund's
   auditors for Audit-Related
   Services not denoted as
   "pre-approved", or
   to add a specific service
   subcategory as "pre-approved"
 ------------------------------------- ------------------------------------




                     SECTION III - POLICY DETAIL, CONTINUED

----------------------- --------------------------- -----------------------------------------------
   SERVICE CATEGORY          SERVICE CATEGORY        SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES
                               DESCRIPTION
----------------------- --------------------------- -----------------------------------------------
                                              
III. TAX SERVICES       Services which are not      o Tax planning and support
                        prohibited by the Rule,     o Tax controversy assistance
                        if an officer of the Fund   o Tax compliance, tax returns, excise
                        determines that using the     tax returns and support
                        Fund's auditor to provide   o Tax opinions
                        these services creates
                        significant synergy in
                        the form of efficiency,
                        minimized disruption, or
                        the ability to maintain a
                        desired level of
                        confidentiality.
----------------------- --------------------------- -----------------------------------------------

------------------------------------- -------------------------
  AUDIT COMMITTEE APPROVAL POLICY         AUDIT COMMITTEE
                                          REPORTING POLICY
------------------------------------- -------------------------
------------------------------------- -------------------------
o "One-time" pre-approval             o A summary of
  for the fund fiscal  year             all such services and
  within a specified dollar limit       related fees
  				        (including comparison
  			                to specified dollar
  			                limits) reported
  			                quarterly.

o Specific approval is
  needed to exceed the
  pre-approved dollar limits for
  these services (see general
  Audit Committee approval policy
  below for details on obtaining
  specific approvals)

o Specific approval is
  needed to use the Fund's
  auditors for tax services not
  denoted as pre-approved, or to add a specific
  service subcategory as
  "pre-approved"
------------------------------------- -------------------------




                     SECTION III - POLICY DETAIL, CONTINUED

----------------------- --------------------------- -----------------------------------------------
   SERVICE CATEGORY          SERVICE CATEGORY        SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES
                               DESCRIPTION
----------------------- --------------------------- -----------------------------------------------
                                              
IV.  OTHER SERVICES     Services which are not      o Business Risk Management support
                        prohibited by the Rule,     o Other control and regulatory
A. SYNERGISTIC,         if an officer of the Fund     compliance projects
UNIQUE QUALIFICATIONS   determines that using the
                        Fund's auditor to provide
                        these services creates
                        significant synergy in
                        the form of efficiency,
                        minimized disruption,
                        the ability to maintain a
                        desired level of
                        confidentiality, or where
                        the Fund's auditors
                        posses unique or superior
                        qualifications to provide
                        these services, resulting
                        in superior value and
                        results for the Fund.
----------------------- --------------------------- -----------------------------------------------

--------------------------------------- ------------------------
    AUDIT COMMITTEE APPROVAL POLICY         AUDIT COMMITTEE
                                            REPORTING POLICY
------------------------------------- --------------------------
                                   
o "One-time" pre-approval             o A summary of
  for the fund fiscal year within       all such services and
  a specified dollar limit              related fees
  			               (including comparison
  			                to specified dollar
  				        limits) reported
                                        quarterly.
o Specific approval is
  needed to exceed the
  pre-approved dollar limits for
  these services (see general
  Audit Committee approval policy
  below for details on obtaining
  specific approvals)

o Specific approval is
  needed to use the Fund's
  auditors for "Synergistic" or
  "Unique Qualifications" Other
  Services not denoted as
  pre-approved to the left, or to
  add a specific service
  subcategory as "pre-approved"
------------------------------------- --------------------------




                     SECTION III - POLICY DETAIL, CONTINUED

----------------------- ------------------------- -----------------------------------------------
   SERVICE CATEGORY         SERVICE CATEGORY        SPECIFIC PROHIBITED SERVICE SUBCATEGORIES
                              DESCRIPTION
----------------------- ------------------------- -----------------------------------------------
                                            
PROHIBITED  SERVICES    Services which result     1. Bookkeeping or other services
                        in the auditors losing       related to the accounting records or
                        independence status          financial statements of the audit
                        under the Rule.              client*
                                                  2. Financial information systems design
                                                     and implementation*
                                                  3. Appraisal or valuation services,
                                                     fairness* opinions, or
                                                     contribution-in-kind reports
                                                  4. Actuarial services (i.e., setting
                                                     actuarial reserves versus actuarial
                                                     audit work)*
                                                  5. Internal audit outsourcing services*
                                                  6. Management functions or human
                                                     resources
                                                  7. Broker or dealer, investment
                                                     advisor, or investment banking services
                                                  8. Legal services and expert services
                                                     unrelated to the audit
                                                  9. Any other service that the Public
                                                     Company Accounting Oversight Board
                                                     determines, by regulation, is
                                                     impermissible
----------------------- ------------------------- -----------------------------------------------

------------------------------------------- ------------------------------
     AUDIT COMMITTEE APPROVAL POLICY               AUDIT COMMITTEE
                                                  REPORTING POLICY
------------------------------------------- ------------------------------
o These services are not to be              o A summary of all
  performed with the exception of the(*)      services and related
  services that may be permitted              fees reported at each
  if they would not be subject to audit       regularly scheduled
  procedures at the audit client (as          Audit Committee meeting
  defined in rule 2-01(f)(4)) level           will serve as continual
  the firm providing the service.             confirmation that has
  				              not provided any
                                              restricted services.
------------------------------------------- ------------------------------

--------------------------------------------------------------------------------
GENERAL AUDIT COMMITTEE APPROVAL POLICY:
o For all projects, the officers of the Funds and the Fund's auditors will each
  make an assessment to determine that any proposed projects will not impair
  independence.

o Potential services will be classified into the four non-restricted service
  categories and the "Approval of Audit, Audit-Related, Tax and Other
  Services" Policy above will be applied. Any services outside the specific
  pre-approved service subcategories set forth above must be specifically
  approved by the Audit Committee.

o At least quarterly, the Audit Committee shall review a report summarizing the
  services by service category, including fees, provided by the Audit firm as
  set forth in the above policy.

--------------------------------------------------------------------------------


    (2) Disclose the percentage of services described in each of paragraphs (b)
   through (d) of this Item that were approved by the audit committee pursuant
   to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X.

Non-Audit Services
Beginning with non-audit service contracts entered into on
or after May 6, 2003, the effective date of the new SEC pre-
approval rules, the Trust's audit committee is required to
pre-approve services to affiliates defined by SEC rules to the
extent that the services are determined to have a direct
impact on the operations or financial reporting of the Trust.
For the years ended April 30, 2011 and 2010, there were no
services provided to an affiliate that required the Trust's
audit committee pre-approval.

(f) If greater than 50 percent, disclose the percentage of hours expended on the
principal accountant's engagement to audit the registrant's financial statements
for the most recent fiscal year that were attributed to work performed by
persons other than the principal accountant's full-time, permanent employees.

N/A

(g) Disclose the aggregate non-audit fees billed by the registrant's accountant
for services rendered to the registrant, and rendered to the registrant's
investment adviser (not including any sub-adviser whose role is primarily
portfolio management and is subcontracted with or overseen by another investment
adviser), and any entity controlling, controlled by, or under common control
with the adviser that provides ongoing services to the registrant for each of
the last two fiscal years of the registrant.

The aggregate non-audit fees for the Trust and affiliates, as
previously defined, totaled approximately $17,942 in 2011
and $17,942 in 2010.


(h) Disclose whether the registrant's audit committee of the board of trustees
has considered whether the provision of non-audit services that were rendered to
the registrant's investment adviser (not including any subadviser whose role is
primarily portfolio management and is subcontracted with or overseen by another
investment adviser), and any entity controlling, controlled by, or under common
control with the investment adviser that provides ongoing services to the
registrant that were not pre-approved pursuant to paragraph (c)(7)(ii) of
Rule 2-01 of Regulation S-X is compatible with maintaining the principal
accountant's independence.

The Trust's audit committee of the Board of Trustees has
considered whether the provision of non-audit services
that were rendered to the Affiliates (as defined) that were
not pre-approved pursuant to paragraph (c)(7)(ii) of Rule
2-01 of Regulation S-X is compatible with maintaining
the principal accountant's independence.

Item 5. Audit Committee of Listed Registrants

(a) If the registrant is a listed issuer as defined in Rule 10A-3
under the Exchange Act (17 CFR 240.10A-3), state whether
or not the registrant has a separately-designated standing
 audit committee established in accordance with Section
3(a)(58)(A) of the Exchange Act (15 U.S.C. 78c(a)(58)(A)).
If the registrant has such a committee, however designated,
identify each committee member. If the entire board of directors
is acting as the registrants audit committee as specified in
Section 3(a)(58)(B) of the Exchange Act (15 U.S.C. 78c(a)(58)(B)),
so state.

The registrant has a separately-designated standing audit
committee established in accordance with Section
3(a)(58)(A) of the Exchange Act (15 U.S.C. 78c(a)(58)(A)).

(b) If applicable, provide the disclosure required by Rule 10A-3(d)
under the Exchange Act (17 CFR 240.10A-3(d)) regarding an exemption
from the listing standards for audit committees.

N/A

Item 6. Schedule of Investments.

File Schedule I Investments in securities of unaffiliated issuers
as of the close of the reporting period as set forth in 210.12-
12 of Regulation S-X [17 CFR 210.12-12], unless the schedule is
included as part of the report to shareholders filed under Item
1 of this Form.

Included in Item 1


ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR
CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

A closed-end management investment company that is filing an annual report on
this Form N-CSR must, unless it invests exclusively in non-voting securities,
describe the policies and procedures that it uses to determine how to vote
proxies relating to portfolio securities, including the procedures that the
company uses when a vote presents a conflict between the interests of its
shareholders, on the one hand, and those of the company's investment adviser;
principal underwriter; or any affiliated person (as defined in Section 2(a)(3)
of the Investment Company Act of 1940 (15 U.S.C. 80a-2(a)(3)) and the rules
thereunder) of the company, its investment adviser, or its principal
underwriter, on the other. Include any policies and procedures of the company's
investment adviser, or any other third party, that the company uses, or that are
used on the company's behalf, to determine how to vote proxies relating to
portfolio securities.

Proxy Voting Policies and Procedures of
                       Pioneer Investment Management, Inc.

                            VERSION DATED July, 2004

                                    Overview

   Pioneer Investment Management, Inc. ("Pioneer") is a fiduciary that owes
   each of its client's duties of care and loyalty with respect to all
   services undertaken on the client's behalf, including proxy voting. When
   Pioneer has been delegated proxy-voting authority for a client, the duty of
   care requires Pioneer to monitor corporate events and to vote the proxies.
   To satisfy its duty of loyalty, Pioneer must place its client's interests
   ahead of its own and must cast proxy votes in a manner consistent with the
   best interest of its clients. Pioneer will vote all proxies presented in a
   timely manner.

   The Proxy Voting Policies and Procedures are designed to complement
   Pioneer's investment policies and procedures regarding its general
   responsibility to monitor the performance and/or corporate events of
   companies that are issuers of securities held in accounts managed by
   Pioneer. Pioneer's Proxy Voting Policies summarize Pioneer's position on a
   number of issues solicited by companies held by Pioneer's clients. The
   policies are guidelines that provide a general indication on how Pioneer
   would vote but do not include all potential voting scenarios.

   Pioneer's Proxy Voting Procedures detail monitoring of voting, exception
   votes, and review of conflicts of interest and ensure that case-by-case
   votes are handled within the context of the overall guidelines (i.e. best
   interest of client). The overriding goal is that all proxies for US and
   non-US companies that are received promptly will be voted in accordance
   with Pioneer's policies or specific client instructions. All shares in a
   company held by Pioneer-managed accounts will be voted alike, unless a
   client has given us specific voting instructions on an issue or has not
   delegated authority to us or the Proxy Voting Oversight Group determines
   that the circumstances justify a different approach.

   Pioneer does not delegate the authority to vote proxies relating to its
   clients to any of its affiliates, which include other subsidiaries of
   UniCredito.

   Any questions about these policies and procedures should be directed to the
   Proxy Coordinator.

                                       1


                             Proxy Voting Procedures

   Proxy Voting Service
   Pioneer has engaged an independent proxy voting service to assist in the
   voting of proxies. The proxy voting service works with custodians to ensure
   that all proxy materials are received by the custodians and are processed
   in a timely fashion. To the extent applicable, the proxy voting service
   votes all proxies in accordance with the proxy voting policies established
   by Pioneer. The proxy voting service will refer proxy questions to the
   Proxy Coordinator (described below) for instructions under circumstances
   where: (1) the application of the proxy voting guidelines is unclear; (2) a
   particular proxy question is not covered by the guidelines; or (3) the
   guidelines call for specific instructions on a case-by-case basis. The
   proxy voting service is also requested to call to the Proxy Coordinator's
   attention specific proxy questions that, while governed by a guideline,
   appear to involve unusual or controversial issues. Pioneer reserves the
   right to attend a meeting in person and may do so when it determines that
   the company or the matters to be voted on at the meeting are strategically
   important to its clients.

   Proxy Coordinator
   Pioneer's Director of Investment Operations (the "Proxy Coordinator")
   coordinates the voting, procedures and reporting of proxies on behalf of
   Pioneer's clients. The Proxy Coordinator will deal directly with the proxy
   voting service and, in the case of proxy questions referred by the proxy
   voting service, will solicit voting recommendations and instructions from
   the Director of Portfolio Management US or, to the extent applicable,
   investment sub-advisers. The Proxy Coordinator is responsible for ensuring
   that these questions and referrals are responded to in a timely fashion and
   for transmitting appropriate voting instructions to the proxy voting
   service. The Proxy Coordinator is responsible for verifying with the
   Compliance Department whether Pioneer's voting power is subject to any
   limitations or guidelines issued by the client (or in the case of an
   employee benefit plan, the plan's trustee or other fiduciaries).

   Referral Items
   From time to time, the proxy voting service will refer proxy questions to
   the Proxy Coordinator that are described by Pioneer's policy as to be voted
   on a case-by-case basis, that are not covered by Pioneer's guidelines or
   where Pioneer's guidelines may be unclear with respect to the matter to be
   voted on. Under such certain circumstances, the Proxy Coordinator will seek
   a written voting recommendation from the Director of Portfolio Management
   US. Any such recommendation will include: (i) the manner in which the
   proxies should be voted; (ii) the rationale underlying any such decision;
   and (iii) the disclosure of any contacts or communications made between
   Pioneer and any outside parties concerning the proxy proposal prior to the
   time that the voting instructions are provided. In addition, the Proxy
   Coordinator will ask the Compliance Department to review the question for
   any actual or apparent conflicts of interest as described below under
   "Conflicts of

                                       2


   Interest." The Compliance Department will provide a "Conflicts of Interest
   Report," applying the criteria set forth below under "Conflicts of
   Interest," to the Proxy Coordinator summarizing the results of its review.
   In the absence of a conflict of interest, the Proxy Coordinator will vote
   in accordance with the recommendation of the Director of Portfolio
   Management US.

   If the matter presents a conflict of interest for Pioneer, then the Proxy
   Coordinator will refer the matter to the Proxy Voting Oversight Group for a
   decision. In general, when a conflict of interest is present, Pioneer will
   vote according to the recommendation of the Director of Portfolio
   Management US where such recommendation would go against Pioneer's interest
   or where the conflict is deemed to be immaterial. Pioneer will vote
   according to the recommendation of its proxy voting service when the
   conflict is deemed to be material and the Pioneer's internal vote
   recommendation would favor Pioneer's interest, unless a client specifically
   requests Pioneer to do otherwise. When making the final determination as to
   how to vote a proxy, the Proxy Voting Oversight Group will review the
   report from the Director of Portfolio Management US and the Conflicts of
   Interest Report issued by the Compliance Department.

   Conflicts of Interest
   A conflict of interest occurs when Pioneer's interests interfere, or appear
   to interfere with the interests of Pioneer's clients. Occasionally, Pioneer
   may have a conflict that can affect how its votes proxies. The conflict may
   be actual or perceived and may exist when the matter to be voted on
   concerns:

       o      An affiliate of Pioneer,  such as another company  belonging to
              the UniCredito  Italiano  S.p.A.  banking group (a "UniCredito
              Affiliate");

       o      An issuer of a security for which Pioneer acts as a sponsor,
              advisor, manager, custodian, distributor, underwriter, broker, or
              other similar capacity (including those securities specifically
              declared by PGAM to present a conflict of interest for Pioneer);

       o      An issuer of a security for which UniCredito has informed Pioneer
              that a UniCredito Affiliate acts as a sponsor, advisor, manager,
              custodian, distributor, underwriter, broker, or other similar
              capacity; or

       o      A person with whom Pioneer (or any of its affiliates) has an
              existing, material contract or business relationship that was not
              entered into in the ordinary course of Pioneer's business.

       o      Pioneer will abstain from voting with respect to companies
              directly or indirectly owned by UniCredito Italiano Group, unless
              otherwise directed by a client. In addition, Pioneer will inform
              PGAM Global Compliance and the PGAM Independent Directors before
              exercising such rights.

   Any associate involved in the proxy voting process with knowledge of any
   apparent or actual conflict of interest must disclose such conflict to the
   Proxy Coordinator and the Compliance Department. The Compliance Department
   will review each item referred to Pioneer to determine whether an actual or
   potential conflict of interest with Pioneer exists in connection with the
   proposal(s) to be voted upon. The review will be conducted by comparing the
   apparent parties affected by the proxy proposal being

                                       3


   voted upon against the Compliance Department's internal list of interested
   persons and, for any matches found, evaluating the anticipated magnitude
   and possible probability of any conflict of interest being present. For
   each referral item, the determination regarding the presence or absence of
   any actual or potential conflict of interest will be documented in a
   Conflicts of Interest Report to the Proxy Coordinator.

   Securities Lending
   In conjunction with industry standards Proxies are not available to be
   voted when the shares are out on loan through either Pioneer's lending
   program or a client's managed security lending program. However, Pioneer
   will reserve the right to recall lent securities so that they may be voted
   according to the Pioneer's instructions. If a portfolio manager would like
   to vote a block of previously lent shares, the Proxy Coordinator will work
   with the portfolio manager and Investment Operations to recall the
   security, to the extent possible, to facilitate the vote on the entire
   block of shares.

   Share-Blocking

   "Share-blocking" is a market practice whereby shares are sent to a
   custodian (which may be different than the account custodian) for record
   keeping and voting at the general meeting. The shares are unavailable for
   sale or delivery until the end of the blocking period (typically the day
   after general meeting date).

   Pioneer will vote in those countries with "share-blocking." In the event a
   manager would like to sell a security with "share-blocking", the Proxy
   Coordinator will work with the Portfolio Manager and Investment Operations
   Department to recall the shares (as allowable within the market time-frame
   and practices) and/or communicate with executing brokerage firm. A list of
   countries with "share-blocking" is available from the Investment Operations
   Department upon request.

   Record Keeping
   The Proxy Coordinator shall ensure that Pioneer's proxy voting service:

       o   Retains a copy of the proxy statement received (unless the proxy
           statement is available from the SEC's Electronic Data Gathering,
           Analysis, and Retrieval (EDGAR) system);

       o   Retains a record of the vote cast;

       o   Prepares Form N-PX for filing on behalf of each client that is a
           registered investment company; and

       o   Is able to promptly provide Pioneer with a copy of the voting
           record upon its request.

                                       4


   The Proxy Coordinator shall ensure that for those votes that may require
   additional documentation (i.e. conflicts of interest, exception votes and
   case-by-case votes) the following records are maintained:

       o    A record memorializing the basis for each referral vote cast;

       o    A copy of any document created by Pioneer that was material in
            making the decision on how to vote the subject proxy; and

       o    A copy of any conflict notice, conflict consent or any other
            written communication (including emails or other electronic
            communications) to or from the client (or in the case of an
            employee benefit plan, the plan's trustee or other fiduciaries)
            regarding the subject proxy vote cast by, or the vote
            recommendation of, Pioneer.

       o    Pioneer shall maintain the above records in the client's file for a
            period not less than ten (10) years.

     Disclosure
     Pioneer shall take reasonable measures to inform its clients of the process
     or procedures clients must follow to obtain information regarding how
     Pioneer voted with respect to assets held in their accounts. In addition,
     Pioneer shall describe to clients its proxy voting policies and procedures
     and will furnish a copy of its proxy voting policies and procedures upon
     request. This information may be provided to clients through Pioneer's Form
     ADV (Part II) disclosure, by separate notice to the client, or through
     Pioneer's website.

     Proxy Voting Oversight Group
     The members of the Proxy Voting Oversight Group are Pioneer's: Director of
     Portfolio Management US, Head of Investment Operations, and Director of
     Compliance. Other members of Pioneer will be invited to attend meetings and
     otherwise participate as necessary. The Head of Investment Operations will
     chair the Proxy Voting Oversight Group.

     The Proxy Voting Oversight Group is responsible for developing, evaluating,
     and changing (when necessary) Pioneer's Proxy Voting Policies and
     Procedures. The group meets at least annually to evaluate and review these
     policies and procedures and the services of its third-party proxy voting
     service. In addition, the Proxy Voting Oversight Group will meet as
     necessary to vote on referral items and address other business as
     necessary.

     Amendments
     Pioneer may not amend its Proxy Voting Policies And Procedures without the
     prior approval of the Proxy Voting Oversight Group and its corporate
     parent, Pioneer Global Asset Management S.p.A

                                       5


   Proxy Voting Policies
   Pioneer's sole concern in voting proxies is the economic effect of the
   proposal on the value of portfolio holdings, considering both the short-
   and long-term impact. In many instances, Pioneer believes that supporting
   the company's strategy and voting "for" management's proposals builds
   portfolio value. In other cases, however, proposals set forth by management
   may have a negative effect on that value, while some shareholder proposals
   may hold the best prospects for enhancing it. Pioneer monitors developments
   in the proxy-voting arena and will revise this policy as needed.

   All proxies that are received promptly will be voted in accordance with the
   specific policies listed below. All shares in a company held by
   Pioneer-managed accounts will be voted alike, unless a client has given us
   specific voting instructions on an issue or has not delegated authority to
   us. Proxy voting issues will be reviewed by Pioneer's Proxy Voting
   Oversight Group, which consists of the Director of Portfolio Management US,
   the Director of Investment Operations (the Proxy Coordinator), and the
   Director of Compliance.

   Pioneer has established Proxy Voting Procedures for identifying and
   reviewing conflicts of interest that may arise in the voting of proxies.

   Clients may request, at any time, a report on proxy votes for securities
   held in their portfolios and Pioneer is happy to discuss our proxy votes
   with company management. Pioneer retains a proxy voting service to provide
   research on proxy issues and to process proxy votes.

Administrative
   While administrative items appear infrequently in U.S. issuer proxies, they
   are quite common in non-U.S. proxies.

   We will generally support these and similar management proposals:

       o    Corporate name change.

       o    A change of corporate headquarters.

       o    Stock exchange listing.

       o    Establishment of time and place of annual meeting.

       o    Adjournment or postponement of annual meeting.

       o    Acceptance/approval of financial statements.

       o    Approval of dividend payments, dividend reinvestment plans and other
            dividend-related proposals.

       o    Approval of minutes and other formalities.

                                       6


       o    Authorization of the transferring of reserves and allocation of
            income.

       o    Amendments to authorized signatories.

       o    Approval of accounting method changes or change in fiscal year-end.

       o    Acceptance of labor agreements.

       o    Appointment of internal auditors.

   Pioneer will vote on a case-by-case basis on other routine business;
   however, Pioneer will oppose any routine business proposal if insufficient
   information is presented in advance to allow Pioneer to judge the merit of
   the proposal. Pioneer has also instructed its proxy voting service to
   inform Pioneer of its analysis of any administrative items inconsistent, in
   its view, with supporting the value of Pioneer portfolio holdings so that
   Pioneer may consider and vote on those items on a case-by-case basis.

Auditors
     We normally vote for proposals to:

       o    Ratify the auditors. We will consider a vote against if we are
            concerned about the auditors' independence or their past work for
            the company. Specifically, we will oppose the ratification of
            auditors and withhold votes from audit committee members if
            non-audit fees paid by the company to the auditing firm exceed the
            sum of audit fees plus audit-related fees plus permissible tax
            fees according to the disclosure categories proposed by the
            Securities and Exchange Commission.

       o    Restore shareholder rights to ratify the auditors.

     We will normally oppose proposals that require companies to:

       o    Seek bids from other auditors.

       o    Rotate auditing firms, except where the rotation is statutorily
            required or where rotation would demonstrably strengthen financial
            disclosure.

       o    Indemnify auditors.

       o    Prohibit auditors from engaging in non-audit services for the
            company.

     Board of Directors
     On issues related to the board of directors, Pioneer normally supports
     management. We will, however, consider a vote against management in
     instances where corporate performance has been very poor or where the board
     appears to lack independence.

                                       7


     General Board Issues
     Pioneer will vote for:

       o    Audit, compensation and nominating committees composed of
            independent directors exclusively.

       o    Indemnification for directors for actions taken in good faith in
            accordance with the business judgment rule. We will vote against
            proposals for broader indemnification.

       o    Changes in board size that appear to have a legitimate business
            purpose and are not primarily for anti-takeover reasons.

       o    Election of an honorary director.

     We will vote against:

       o    Minimum stock ownership by directors.

       o    Term limits for directors. Companies benefit from experienced
            directors, and shareholder control is better achieved through
            annual votes.

       o    Requirements for union or special interest representation on the
            board.

       o    Requirements to provide two candidates for each board seat.

     We will vote on a case-by case basis on these issues:

       o    Separate chairman and CEO positions. We will consider voting with
            shareholders on these issues in cases of poor corporate
            performance.

     Elections of Directors
     In uncontested elections of directors we will vote against:

       o    Individual directors with absenteeism above 25% without valid
            reason. We support proposals that require disclosure of director
            attendance.

       o    Insider directors and affiliated outsiders who sit on the audit,
            compensation, stock option or nominating committees. For the
            purposes of our policy, we accept the definition of affiliated
            directors provided by our proxy voting service.

     We will also vote against:

       o    Directors who have failed to act on a takeover offer where the
            majority of shareholders have tendered their shares.

       o    Directors who appear to lack independence or are associated with
            very poor corporate performance.

                                       8


     We will vote on a case-by case basis on these issues:

       o    Re-election of directors who have implemented or renewed a
            dead-hand or modified dead-hand poison pill (a "dead-hand poison
            pill" is a shareholder rights plan that may be altered only by
            incumbent or "dead " directors. These plans prevent a potential
            acquirer from disabling a poison pill by obtaining control of the
            board through a proxy vote).

       o    Contested election of directors.

       o    Prior to phase-in required by SEC, we would consider supporting
            election of a majority of independent directors in cases of poor
            performance.

       o    Mandatory retirement policies.

       o    Directors who have ignored a shareholder proposal that has been
            approved by shareholders for two consecutive years.

     Takeover-Related Measures
     Pioneer is generally opposed to proposals that may discourage takeover
     attempts. We believe that the potential for a takeover helps ensure that
     corporate performance remains high.

     Pioneer will vote for:

       o    Cumulative voting.

       o    Increase ability for shareholders to call special meetings.

       o    Increase ability for shareholders to act by written consent.

       o    Restrictions on the ability to make greenmail payments.

       o    Submitting rights plans to shareholder vote.

       o    Rescinding shareholder rights plans ("poison pills").

       o    Opting out of the following state takeover statutes:

     o Control share acquisition statutes, which deny large holders voting
       rights on holdings over a specified threshold.

     o Control share cash-out provisions, which require large holders to
       acquire shares from other holders.

     o Freeze-out provisions, which impose a waiting period on large
       holders before they can attempt to gain control.

     o Stakeholder laws, which permit directors to consider interests of
       non-shareholder constituencies.

                                       9


     o Disgorgement provisions, which require acquirers to disgorge profits
       on purchases made before gaining control.

     o Fair price provisions.

     o Authorization of shareholder rights plans.

     o Labor protection provisions.

     o Mandatory classified boards.

     We will vote on a case-by-case basis on the following issues:

       o    Fair price provisions. We will vote against provisions requiring
            supermajority votes to approve takeovers. We will also consider
            voting against proposals that require a supermajority vote to
            repeal or amend the provision. Finally, we will consider the
            mechanism used to determine the fair price; we are generally
            opposed to complicated formulas or requirements to pay a premium.

       o    Opting out of state takeover statutes regarding fair price
            provisions. We will use the criteria used for fair price
            provisions in general to determine our vote on this issue.

       o    Proposals that allow shareholders to nominate directors.

     We will vote against:

       o    Classified boards, except in the case of closed-end mutual funds.

       o    Limiting shareholder ability to remove or appoint directors. We
            will support proposals to restore shareholder authority in this
            area. We will review on a case-by-case basis proposals that
            authorize the board to make interim appointments.

       o    Classes of shares with unequal voting rights.

       o    Supermajority vote requirements.

       o    Severance packages ("golden" and "tin" parachutes). We will support
            proposals to put these packages to shareholder vote.

       o    Reimbursement of dissident proxy solicitation expenses. While we
            ordinarily support measures that encourage takeover bids, we
            believe that management should have full control over corporate
            funds.

       o    Extension of advance notice requirements for shareholder proposals.

       o    Granting board authority normally retained by shareholders (e.g.,
            amend charter, set board size).

       o    Shareholder rights plans ("poison pills"). These plans generally
            allow shareholders to buy additional shares at a below-market
            price in the event of a change in control and may deter some bids.

                                       10


     Capital Structure
     Managements need considerable flexibility in determining the company's
     financial structure, and Pioneer normally supports managements' proposals
     in this area. We will, however, reject proposals that impose high barriers
     to potential takeovers.

     Pioneer will vote for:

       o    Changes in par value.

       o    Reverse splits, if accompanied by a reduction in number of shares.

       o    Share repurchase programs, if all shareholders may participate on
            equal terms.

       o    Bond issuance.

       o    Increases in "ordinary" preferred stock.

       o    Proposals to have blank-check common stock placements (other than
            shares issued in the normal course of business) submitted for
            shareholder approval.

       o    Cancellation of company treasury shares.

     We will vote on a case-by-case basis on the following issues:

       o    Reverse splits not accompanied by a reduction in number of shares,
            considering the risk of delisting.

       o    Increase in authorized common stock. We will make a determination
            considering, among other factors:

     o Number of shares currently available for issuance;

     o Size of requested increase (we would normally approve increases of up to
       100% of current authorization);

     o Proposed use of the additional shares; and

     o Potential consequences of a failure to increase the number of shares
       outstanding (e.g., delisting or bankruptcy).

       o    Blank-check preferred. We will normally oppose issuance of a new
            class of blank-check preferred, but may approve an increase in a
            class already outstanding if the company has demonstrated that it
            uses this flexibility appropriately.

       o    Proposals to submit private placements to shareholder vote.

       o    Other financing plans.

     We will vote against preemptive rights that we believe limit a company's
financing flexibility.

                                      11


     Compensation
     Pioneer supports compensation plans that link pay to shareholder returns
     and believes that management has the best understanding of the level of
     compensation needed to attract and retain qualified people. At the same
     time, stock-related compensation plans have a significant economic impact
     and a direct effect on the balance sheet. Therefore, while we do not want
     to micromanage a company's compensation programs, we will place limits on
     the potential dilution these plans may impose.

     Pioneer will vote for:

       o    401(k) benefit plans.

       o    Employee stock ownership plans (ESOPs), as long as shares
            allocated to ESOPs are less than 5% of outstanding shares. Larger
            blocks of stock in ESOPs can serve as a takeover defense. We will
            support proposals to submit ESOPs to shareholder vote.

       o    Various issues related to the Omnibus Budget and Reconciliation Act
            of 1993 (OBRA), including:

     o Amendments to performance plans to conform with OBRA;

     o Caps on annual grants or amendments of administrative features;

     o Adding performance goals; and

     o Cash or cash-and-stock bonus plans.

       o    Establish a process to link pay, including stock-option grants, to
            performance, leaving specifics of implementation to the company.

       o    Require that option repricings be submitted to shareholders.

       o    Require the expensing of stock-option awards.

       o    Require reporting of executive retirement benefits (deferred
            compensation, split-dollar life insurance, SERPs, and pension
            benefits).

       o    Employee stock purchase plans where the purchase price is equal to
            at least 85% of the market price, where the offering period is no
            greater than 27 months and where potential dilution (as defined
            below) is no greater than 10%.

                                       12


     We will vote on a case-by-case basis on the following issues:

       o    Executive and director stock-related compensation plans. We will
            consider the following factors when reviewing these plans:

       o    The program must be of a reasonable size. We will approve plans
            where the combined employee and director plans together would
            generate less than 15% dilution. We will reject plans with 15% or
            more potential dilution.

            Dilution = (A + B + C) / (A + B + C + D), where

            A = Shares reserved for plan/amendment,

            B = Shares available under continuing plans,

            C = Shares granted but unexercised and

            D = Shares outstanding.

       o    The plan must not:

            o   Explicitly permit unlimited option repricing authority or that
                have repriced in the past without shareholder approval.

            o   Be a self-replenishing "evergreen" plan, plans that grant
                discount options and tax offset payments.

     o We are generally in favor of proposals that increase participation beyond
       executives.

     o We generally support proposals asking companies to adopt rigorous
       vesting provisions for stock option plans such as those that vest
       incrementally over, at least, a three- or four-year period with a pro
       rata portion of the shares becoming exercisable on an annual basis
       following grant date.

     o We generally support proposals asking companies to disclose their
       window period policies for stock transactions. Window period policies
       ensure that employees do not exercise options based on insider
       information contemporaneous with quarterly earnings releases and other
       material corporate announcements.

     o We generally support proposals asking companies to adopt stock holding
       periods for their executives.

       o    All other employee stock purchase plans.

       o    All other compensation-related proposals, including deferred
            compensation plans, employment agreements, loan guarantee programs
            and retirement plans.

       o    All other proposals regarding stock compensation plans, including
            extending the life of a plan, changing vesting restrictions,
            repricing options, lengthening exercise periods or accelerating
            distribution of awards and pyramiding and cashless exercise
            programs.

                                       13


     We will vote against:

       o    Pensions for non-employee directors. We believe these retirement
            plans reduce director objectivity.

       o    Elimination of stock option plans.

     We will vote on a case-by case basis on these issues:

       o    Limits on executive and director pay.

       o    Stock in lieu of cash compensation for directors.

     Corporate Governance
     Pioneer will vote for:

       o    Confidential Voting.

       o    Equal access provisions, which allow shareholders to contribute
            their opinion to proxy materials.

       o    Proposals requiring directors to disclose their ownership of shares
            in the company.

     We will vote on a case-by-case basis on the following issues:

       o    Change in the state of incorporation. We will support
            reincorporations supported by valid business reasons. We will
            oppose those that appear to be solely for the purpose of
            strengthening takeover defenses.

       o    Bundled proposals. We will evaluate the overall impact of the
            proposal.

       o    Adopting or amending the charter, bylaws or articles of association.

       o    Shareholder appraisal rights, which allow shareholders to demand
            judicial review of an acquisition price.

     We will vote against:

       o    Shareholder advisory committees. While management should solicit
            shareholder input, we prefer to leave the method of doing so to
            management's discretion.

       o    Limitations on stock ownership or voting rights.

       o    Reduction in share ownership disclosure guidelines.

                                       14


     Mergers and Restructurings
     Pioneer will vote on the following and similar issues on a case-by-case
     basis:

       o    Mergers and acquisitions.

       o    Corporate restructurings, including spin-offs, liquidations, asset
            sales, joint ventures, conversions to holding company and
            conversions to self-managed REIT structure.

       o    Debt restructurings.

       o    Conversion of securities.

       o    Issuance of shares to facilitate a merger.

       o    Private placements, warrants, convertible debentures.

       o    Proposals requiring management to inform shareholders of merger
            opportunities.

     We will normally vote against shareholder proposals requiring that the
     company be put up for sale.

     Mutual Funds
     Many of our portfolios may invest in shares of closed-end mutual funds or
     exchange-traded funds. The non-corporate structure of these investments
     raises several unique proxy voting issues.

     Pioneer will vote for:

       o    Establishment of new classes or series of shares.

       o    Establishment of a master-feeder structure.

     Pioneer will vote on a case-by-case on:

       o    Changes in investment policy. We will normally support changes
            that do not affect the investment objective or overall risk level
            of the fund. We will examine more fundamental changes on a
            case-by-case basis.

       o    Approval of new or amended advisory contracts.

       o    Changes from closed-end to open-end format.

       o    Authorization for, or increase in, preferred shares.

       o    Disposition of assets, termination, liquidation, or mergers.

       o    Classified boards of closed-end mutual funds, but will typically
            support such proposals.

                                       15


     Social Issues
     Pioneer will abstain on stockholder proposals calling for greater
     disclosure of corporate activities with regard to social issues. "Social
     Issues" may generally be described as shareholder proposals for a company
     to:

       o    Conduct studies regarding certain issues of public concern and
            interest;

       o    Study the feasibility of the company taking certain actions with
            regard to such issues; or

       o    Take specific action, including ceasing certain behavior and
            adopting company standards and principles, in relation to issues
            of public concern and interest.

     We believe these issues are important and should receive management
     attention.

     Pioneer will vote against proposals calling for substantial changes in the
     company's business or activities. We will also normally vote against
     proposals with regard to contributions, believing that management should
     control the routine disbursement of funds.

                                       16



Item 8. Portfolio Managers of Closed-End Management Investment
        Companies.

(a) If the registrant is a closed-end management investment company that
is filing an annual report on this Form N-CSR,provide the following
information:
(1) State the name, title, and length of service of the person or persons
employed by or associated with the registrant or an investment adviser
of the registrant who are primarily responsible for the day-to-day management
of the registrants portfolio (Portfolio Manager). Also state each Portfolio
Managers business experience during the past 5 years.




PORTFOLIO MANAGEMENT

ADDITIONAL INFORMATION ABOUT THE PORTFOLIO MANAGERS

OTHER ACCOUNTS MANAGED BY THE PORTFOLIO MANAGERS.  The table below indicates,
for each portfolio manager of the fund, information about the accounts other
than the fund over which the portfolio manager has day-to-day investment
responsibility.  All information on the number of accounts and total assets in
the table is as of April 30, 2011. For purposes of the table, "Other Pooled
Investment Vehicles" may include investment partnerships, undertakings for
collective investments in transferable securities ("UCITS") and other non-U.S.
investment funds and group trusts, and "Other Accounts" may include separate
accounts for institutions or individuals, insurance company general or separate
accounts, pension funds and other similar institutional accounts but generally
do not include the portfolio manager's personal investment accounts or those
which the manager may be deemed to own beneficially under the code of ethics.
Certain funds and other accounts managed by the portfolio manager may have
substantially similar investment strategies.


NAME OF PORTFOLIO MANAGER     TYPE OF ACCOUNT     NUMBER OF ACCOUNTS MANAGED
-------------------------     ---------------     --------------------------
TOTAL ASSETS MANAGED     NUMBER OF ACCOUNTS MANAGED FOR WHICH ADVISORY FEE IS
--------------------     ----------------------------------------------------
PERFORMANCE-BASED     ASSETS MANAGED FOR WHICH ADVISORY FEE IS PERFORMANCE-BASED
-----------------     ----------------------------------------------------------
David Eurkus
------------
     Other Registered Investment Companies     3     $1,925,717,000     N/A
     -------------------------------------     -     --------------     ---
N/A
---
     Other Pooled Investment Vehicles     0     $0     N/A     N/A
     --------------------------------     -     --     ---     ---
     Other Accounts     1     $10,644,000     N/A     N/A
     --------------     -     -----------     ---     ---



NAME OF PORTFOLIO MANAGER     TYPE OF ACCOUNT     NUMBER OF ACCOUNTS MANAGED
-------------------------     ---------------     --------------------------
TOTAL ASSETS MANAGED     NUMBER OF ACCOUNTS MANAGED FOR WHICH ADVISORY FEE IS
--------------------     ----------------------------------------------------
PERFORMANCE-BASED     ASSETS MANAGED FOR WHICH ADVISORY FEE IS PERFORMANCE-BASED
-----------------     ----------------------------------------------------------
Timothy Pynchon
---------------
     Other Registered Investment Companies     3     $1,925,717,000     N/A
     -------------------------------------     -     --------------     ---
N/A
---
     Other Pooled Investment Vehicles     0     $0     N/A     N/A
     --------------------------------     -     --     ---     ---
     Other Accounts     0     $0     N/A     N/A
     --------------     -     --     ---     ---


POTENTIAL CONFLICTS OF INTEREST.  When a portfolio manager is responsible for
the management of more than one account, the potential arises for the portfolio
manager to favor one account over another. The principal types of potential
conflicts of interest that may arise are discussed below. For the reasons
outlined below, Pioneer does not believe that any material conflicts are likely
to arise out of a portfolio manager's responsibility for the management of the
fund as well as one or more other accounts.  Although Pioneer has adopted
procedures that it believes are reasonably designed to detect and prevent
violations of the federal securities laws and to mitigate the potential for
conflicts of interest to affect its portfolio management decisions, there can be
no assurance that all conflicts will be identified or that all procedures will
be effective in mitigating the potential for such risks. Generally, the risks of
such conflicts of interest are increased to the extent that a portfolio manager
has a financial incentive to favor one account over another. Pioneer has
structured its compensation arrangements in a manner that is intended to limit
such potential for conflicts of interest.  See "Compensation of Portfolio
Managers" below.
-     A portfolio manager could favor one account over another in allocating new
investment opportunities that have limited supply, such as initial public
offerings and private placements. If, for example, an initial public offering
that was expected to appreciate in value significantly shortly after the
offering was allocated to a single account, that account may be expected to have
better investment performance than other accounts that did not receive an
allocation of the initial public offering. Generally, investments for which
there is limited availability are allocated based upon a range of factors
including available cash and consistency with the accounts' investment
objectives and policies. This allocation methodology necessarily involves some
subjective elements but is intended over time to treat each client in an
equitable and fair manner. Generally, the investment opportunity is allocated
among participating accounts on a pro rata basis.  Although Pioneer believes
that its practices are reasonably designed to treat each client in an equitable
and fair manner, there may be instances where a fund may not participate, or may
participate to a lesser degree than other clients, in the allocation of an
investment opportunity.
-     A portfolio manager could favor one account over another in the order in
which trades for the accounts are placed.  If a portfolio manager determines to
purchase a security for more than one account in an aggregate amount that may
influence the market price of the security, accounts that purchased or sold the
security first may receive a more favorable price than accounts that made
subsequent transactions. The less liquid the market for the security or the
greater the percentage that the proposed aggregate purchases or sales represent
of average daily trading volume, the greater the potential for accounts that
make subsequent purchases or sales to receive a less favorable price. When a
portfolio manager intends to trade the same security on the same day for more
than one account, the trades typically are "bunched," which means that the
trades for the individual accounts are aggregated and each account receives the
same price.  There are some types of accounts as to which bunching may not be
possible for contractual reasons (such as directed brokerage arrangements).
Circumstances may also arise where the trader believes that bunching the orders
may not result in the best possible price. Where those accounts or circumstances
are involved, Pioneer will place the order in a manner intended to result in as
favorable a price as possible for such client.
-     A portfolio manager could favor an account if the portfolio manager's
compensation is tied to the performance of that account to a greater degree than
other accounts managed by the portfolio manager.  If, for example, the portfolio
manager receives a bonus based upon the performance of certain accounts relative
to a benchmark while other accounts are disregarded for this purpose, the
portfolio manager will have a financial incentive to seek to have the accounts
that determine the portfolio manager's bonus achieve the best possible
performance to the possible detriment of other accounts.  Similarly, if Pioneer
receives a performance-based advisory fee, the portfolio manager may favor that
account, whether or not the performance of that account directly determines the
portfolio manager's compensation.
-     A portfolio manager could favor an account if the portfolio manager has a
beneficial interest in the account, in order to benefit a large client or to
compensate a client that had poor returns. For example, if the portfolio manager
held an interest in an investment partnership that was one of the accounts
managed by the portfolio manager, the portfolio manager would have an economic
incentive to favor the account in which the portfolio manager held an interest.
-     If the different accounts have materially and potentially conflicting
investment objectives or strategies, a conflict of interest could arise. For
example, if a portfolio manager purchases a security for one account and sells
the same security for another account, such trading pattern may disadvantage
either the account that is long or short.  In making portfolio manager
assignments, Pioneer seeks to avoid such potentially conflicting situations.
However, where a portfolio manager is responsible for accounts with differing
investment objectives and policies, it is possible that the portfolio manager
will conclude that it is in the best interest of one account to sell a portfolio
security while another account continues to hold or increase the holding in such
security.

COMPENSATION OF PORTFOLIO MANAGERS.  Pioneer has adopted a system of
compensation for portfolio managers that seeks to align the financial interests
of the portfolio managers with those of shareholders of the accounts (including
Pioneer funds) the portfolio managers manage, as well as with the financial
performance of Pioneer. The compensation program for all Pioneer portfolio
managers includes a base salary (determined by the rank and tenure of the
employee) and an annual bonus program, as well as customary benefits that are
offered generally to all full-time employees. Base compensation is fixed and
normally reevaluated on an annual basis.  Pioneer seeks to set base compensation
at market rates, taking into account the experience and responsibilities of the
portfolio manager. The bonus plan is intended to provide a competitive level of
annual bonus compensation that is tied to the portfolio manager achieving
superior investment performance and align the interests of the investment
professional with those of shareholders, as well as with the financial
performance of Pioneer. Any bonus under the plan is completely discretionary,
with a maximum annual bonus that may be in excess of base salary. The annual
bonus is based upon a combination of the following factors:

-     Quantitative Investment Performance. The quantitative investment
performance calculation is based on pre-tax investment performance of all of the
accounts managed by the portfolio manager (which includes the fund and any other
accounts managed by the portfolio manager) over a one-year period (20%
weighting) and four-year period (80% weighting), measured for periods ending on
December 31. The accounts, which include the fund, are ranked against a group of
mutual funds with similar investment objectives and investment focus (60%) and a
broad-based securities market index measuring the performance of the same type
of securities in which the accounts invest (40%), which, in the case of the
fund, is the Barclay's Capital Municipal Bond Index and the Barclay's Capital
High Yield Municipal Bond Index .  As a result of these two benchmarks, the
performance of the portfolio manager for compensation purposes is measured
against the criteria that are relevant to the portfolio manager's competitive
universe.

-     Qualitative Performance. The qualitative performance component with
respect to all of the accounts managed by the portfolio manager includes
objectives, such as effectiveness in the areas of teamwork, leadership,
communications and marketing, that are mutually established and evaluated by
each portfolio manager and management.

-     Pioneer Results and Business Line Results. Pioneer's financial
performance, as well as the investment performance of its investment management
group, affect a portfolio manager's actual bonus by a leverage factor of plus or
minus (+/-) a predetermined percentage.

The quantitative and qualitative performance components comprise 80% and 20%,
respectively, of the overall bonus calculation (on a pre-adjustment basis).  A
portion of the annual bonus is deferred for a specified period and may be
invested in one or more Pioneer funds.

Certain portfolio managers may participate in other programs designed to reward
and retain key contributors.  Senior executives or other key employees may be
granted performance units based on the stock price performance of UniCredit and
the financial performance of Pioneer Global Asset Management S.p.A., which are
affiliates of Pioneer. Portfolio managers also may participate in a deferred
compensation program, whereby deferred amounts are invested in one or more
Pioneer funds.


SHARE OWNERSHIP BY PORTFOLIO MANAGERS.  The following table indicates as of
April 30, 2011 the value, within the indicated range, of shares beneficially
owned by the portfolio managers of the fund.
NAME OF PORTFOLIO MANAGER     BENEFICIAL OWNERSHIP OF THE FUND*
-------------------------     ---------------------------------
David Eurkus     A
------------     -
Timothy Pynchon     C
---------------     -

*Key to Dollar Ranges
A.     None
B.     $1 - $10,000
C.     $10,001 - $50,000
D.     $50,001 - $100,000
E.     $100,001 - $500,000
F.     $500,001 - $1,000,000
G.     Over $1,000,000



Item 9. Purchases of Equity Securities by Closed-End Management
Investment Company and Affiliated Purchasers.

(a) If the registrant is a closed-end management investment company,
in the following tabular format, provide the information specified in
paragraph (b) of this Item with respect to any purchase made by or on
behalf of the registrant or any affiliated purchaser, as defined in
Rule 10b-18(a)(3) under the Exchange Act (17 CFR 240.10b-18(a)(3)), of
shares or other units of any class of the registrants equity securities
that is registered by the registrant pursuant to Section 12 of the
Exchange Act (15 U.S.C. 781). Instruction to paragraph (a). Disclose
all purchases covered by this Item, including purchases that do not
satisfy the conditions of the safe harbor of Rule 10b-18 under the
Exchange Act (17 CFR 240.10b-18), made in the period covered by the
report. Provide disclosures covering repurchases made on a monthly basis.
For example, if the reporting period began on January 16 and ended on
July 15, the chart would show repurchases for the months from January 16
through February 15, February 16 through March 15, March 16 through
April 15, April 16 through May 15, May 16 through June 15, and June 16
through July 15.

During the period covered by this report, there were no purchases
made by or on behalf of the registrant or any affiliated purchaser
as defined in Rule 10b-18(a)(3) under the Securities Exchange Act
of 1934 (the Exchange Act), of shares of the registrants equity
securities that are registered by the registrant pursuant to
Section 12 of the Exchange Act.


Item 10. Submission of Matters to a Vote of Security Holders.

Describe any material changes to the procedures by which shareholders
may recommend nominees to the registrants board of directors, where
those changes were implemented after the registrant last provided
disclosure in response to the requirements of Item 7(d)(2)(ii)(G)
of Schedule 14A (17 CFR 240.14a-101), or this Item.


There have been no material changes to the procedures by which the
shareholders may recommend nominees to the registrants board of
directors since the registrant last provided disclosure in response
to the requirements of Item 7(d)(2)(ii)(G) of Schedule 14(A) in
its definitive proxy statement, or this Item.


ITEM 11. CONTROLS AND PROCEDURES.

(a) Disclose the conclusions of the registrant's principal executive officer or
officers and principal financial officer or officers, or persons performing
similar functions, about the effectiveness of the registrant's disclosure
controls and procedures (as defined in Rule 30a-2(c) under the Act (17 CFR
270.30a-2(c))) based on their evaluation of these controls and procedures as of
a date within 90 days of the filing date of the report that includes the
disclosure required by this paragraph.

The registrant's principal executive officer
and principal financial officer have
concluded that the registrant's disclosure
controls and procedures are effective based
on their evaluation of these controls and
procedures as of a date within 90 days of the
filing date of this report.


(b) Disclose whether or not there were significant changes in the registrant's
internal controls or in other factors that could significantly affect these
controls subsequent to the date of their evaluation, including any corrective
actions with regard to significant deficiencies and material weaknesses.

There were no significant changes in the
registrant's internal control over financial
reporting that occurred during the second
fiscal quarter of the period covered by this
report that have materially affected, or are
reasonably likely to materially affect, the
registrant's internal control over financial
reporting.

The registrant's principal executive officer and principal financial
officer, however, voluntarily are reporting the following information:

In August of 2006 the registrant's investment adviser
enhanced its internal procedures for reporting performance
information required to be included in prospectuses.
Those enhancements involved additional internal controls
over the appropriateness of performance data
generated for this purpose.  Such enhancements were made
following an internal review which identified
prospectuses relating to certain classes of shares of
a limited number of registrants where, inadvertently,
performance information not reflecting the deduction of
applicable sales charges was included. Those prospectuses
were revised, and the revised prospectuses were distributed to
shareholders.


ITEM 12. EXHIBITS.

File the exhibits listed below as part of this Form. Letter or number the
exhibits in the sequence indicated.

(a) Any code of ethics, or amendment thereto, that is the subject of the
disclosure required by Item 2, to the extent that the registrant intends to
satisfy the Item 2 requirements through filing of an exhibit.



(b) A separate certification for each principal executive officer and principal
financial officer of the registrant as required by Rule 30a-2 under the Act
(17 CFR 270.30a-2).

Filed herewith.





                                   SIGNATURES

                          [See General Instruction F]


Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, the registrant has duly caused this report to be
signed on its behalf by the undersigned, thereunto duly authorized.


(Registrant) Pioneer Municipal High Income Trust


By (Signature and Title)* /s/ John F. Cogan, Jr.
John F. Cogan, Jr, President

Date June 29, 2011


Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, this report has been signed below by the
following persons on behalf of the registrant and in the capacities and on the
dates indicated.


By (Signature and Title)* /s/ John F. Cogan, Jr.
John F. Cogan, Jr., President

Date June 29, 2011


By (Signature and Title)* /s/ Mark Bradley
Mark Bradley, Treasurer

Date June 29, 2011

* Print the name and title of each signing officer under his or her signature.