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

                                    FORM N-PX
               ANNUAL REPORT OF PROXY VOTING RECORD OF REGISTERED
                         MANAGEMENT INVESTMENT COMPANIES

                  Investment Company Act file number 811-22014
                                      -----

PIONEER DIVERSIFIED HIGH INCOME TRUST
----------------------------------------------------
(Exact name of registrant as specified in charter)

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

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

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

Date of fiscal year end:  March 31

Date of reporting period:  July 1, 2009 to June 30, 2010

SIGNATURES

Pursuant to the requirements of 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 Diversified High Income Trust

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

Date  August 19, 2010
      ----------------



==================== PIONEER DIVERSIFIED HIGH INCOME TRUST =====================


AINSWORTH LUMBER CO LTD

Ticker:       ANS            Security ID:  C01023206
Meeting Date: MAY 13, 2010   Meeting Type: Annual
Record Date:  APR 13, 2010

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Robert Chadwick          For       For          Management
1.2   Elect Director Jay Gurandiano           For       For          Management
1.3   Elect Director Paul Houston             For       For          Management
1.4   Elect Director Richard Huff             For       Withhold     Management
1.5   Elect Director John Lacey               For       For          Management
1.6   Elect Director Gordon Lancaster         For       For          Management
1.7   Elect Director Jonathan I. Mishkin      For       For          Management
2     Approve Deloitte & Touche LLP as        For       For          Management
      Auditors and Authorize Board to Fix
      Their Remuneration


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ALERIS INTERNATIONAL INC

Ticker:                      Security ID:  014477AG8
Meeting Date: APR 29, 2010   Meeting Type: Written Consent
Record Date:  MAR 10, 2010

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     The Plan                                None      For          Management


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ARCO CHEMICAL CO.

Ticker:       RCM            Security ID:  001920AB3
Meeting Date: APR 15, 2010   Meeting Type: Written Consent
Record Date:  MAR 12, 2010

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     The Plan                                None      For          Management
2     I Am A Qualified Investor               None      For          Management


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GEORGIA GULF CORPORATION

Ticker:       GGC            Security ID:  373200302
Meeting Date: MAY 18, 2010   Meeting Type: Annual
Record Date:  MAR 26, 2010

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Mark L. Noetzel          For       For          Management
1.2   Elect Director Stephen E. Macadam       For       For          Management
1.3   Elect Director David N. Weinstein       For       For          Management
2     Adopt Majority Voting for Uncontested   For       For          Management
      Election of Directors
3     Declassify the Board of Directors       For       For          Management
4     Reduce Supermajority Vote Requirement   For       For          Management
5     Ratify Auditors                         For       For          Management


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LEAR CORPORATION

Ticker:       LEA            Security ID:  521865204
Meeting Date: MAY 13, 2010   Meeting Type: Annual
Record Date:  MAR 22, 2010

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Ratify Auditors                         For       For          Management


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NEXUS FLOATING PRODUCTION LTD.

Ticker:       NEXUS          Security ID:  Y6265HAA0
Meeting Date: JUL 3, 2009    Meeting Type: Bondholder
Record Date:

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Approve Summons                         For       For          Management
2     Approve Agenda                          For       For          Management
3     Approve Election of Two Bondholders to  For       For          Management
      Sign Minutes Together with the
      Chairperson
4     Approve Change of the Loan Agreement    For       For          Management


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NEXUS FLOATING PRODUCTION LTD.

Ticker:       NEXUS          Security ID:  Y6265HAA0
Meeting Date: JUL 29, 2009   Meeting Type: Bondholder
Record Date:

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Approve Summons                         For       For          Management
2     Approve Agenda                          For       For          Management
3     Approve Election of Two Bondholders to  For       For          Management
      Sign Minutes Together with the
      Chairperson
4     Approve Request for Change of the Loan  For       For          Management
      Agreement


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NEXUS FLOATING PRODUCTION LTD.

Ticker:       NEXUS          Security ID:  Y6265HAA0
Meeting Date: AUG 24, 2009   Meeting Type: Bondholder
Record Date:

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Approve Summons                         For       For          Management
2     Approve Agenda                          For       For          Management
3     Approve Election of Two Bondholders to  For       For          Management
      Sign the Minutes Together With the
      Chairperson
4     Approve Request for Change of the Bond  For       For          Management
      Loan Agreement


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NEXUS FLOATING PRODUCTION LTD.

Ticker:       NEXUS          Security ID:  Y6265HAA0
Meeting Date: NOV 11, 2009   Meeting Type: Bondholder
Record Date:

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Approve Summons                         For       For          Management
2     Approve Agenda                          For       For          Management
3     Approve Election of Two Bondholders to  For       For          Management
      Sign the Minutes Together With the
      Chairperson
4     Approve Restructuring and Changes to    For       For          Management
      the Bond Loan Agreements


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SEVAN MARINE ASA

Ticker:       SEVAN          Security ID:  R776D4AE3
Meeting Date: JUN 25, 2010   Meeting Type: Bondholder
Record Date:  JUN 11, 2010

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Approve Summons                         For       For          Management
2     Approve Agenda                          For       For          Management
3     Elect Minutes Keepers                   For       For          Management
4     Approve Amendments to Bond Agreement    For       For          Management


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SKEIE DRILLING & PRODUCTION ASA

Ticker:       SKDP           Security ID:  R7034SAB0
Meeting Date: JUL 15, 2009   Meeting Type: Bondholder
Record Date:

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Approval of the Summons                 For       For          Management
2     Approval of the Agenda                  For       For          Management
3     Designate Inspector(s) of Minutes of    For       For          Management
      the Meeting
4     Amend Resolutions Passed at June 29,    For       For          Management
      2009 Meeting Re: Consent from the
      Lending Syndicate; Proportionate
      Dilution of Ownership of Skeie Group
      and Wideluck; The Event of Default


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SKEIE DRILLING & PRODUCTION ASA

Ticker:       SKDP           Security ID:  R7034S104
Meeting Date: SEP 24, 2009   Meeting Type: Special
Record Date:

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Open Meeting; Registration of Attending None      None         Management
      Shareholders and Proxies
2     Elect Chairman of Meeting; Designate    For       For          Management
      Inspector(s) of Minutes of Meeting
3     Approve Notice of Meeting and Agenda    For       For          Management
4     Elect Lesley Jones and Ngiam Jih Wong   For       For          Management
      as Directors
5     Amend Articles Re: Approve Electronic   For       For          Management
      Publication of Meeting Notice Material


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SKEIE DRILLING & PRODUCTION ASA

Ticker:       SKDP           Security ID:  R7034S104
Meeting Date: MAY 6, 2010    Meeting Type: Special
Record Date:  APR 22, 2010

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Open Meeting; Registration of Attending None      None         Management
      Shareholders and Proxies
2     Elect Chairman of Meeting; Designate    For       For          Management
      Inspector(s) of Minutes of Meeting
3     Approve Notice of Meeting and Agenda    For       For          Management
4     Approve Issuance of 208.2 Million       For       For          Management
      Shares for a Private Placement
5     Approve Creation of NOK 21 Million Pool For       For          Management
      of Capital without Preemptive Rights


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SKEIE DRILLING & PRODUCTION ASA

Ticker:       SKDP           Security ID:  R7034S104
Meeting Date: JUN 22, 2010   Meeting Type: Annual
Record Date:  JUN 8, 2010

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Open Meeting; Registration of Attending None      None         Management
      Shareholders and Proxies
2     Elect Chairman of Meeting; Designate    For       For          Management
      Inspector(s) of Minutes of Meeting
3     Approve Notice of Meeting and Agenda    For       For          Management
4     Approve Financial Statements and        For       For          Management
      Statutory Reports
5     Approve Remuneration of Directors in    For       For          Management
      the Amounts of NOK 450,000 to Bjarne
      Skeie, NOK 208,333 to Margaret Hawkins,
      NOK 250,000 to Anne Breive, NOK 208,333
      to Ngiam Wong, and NOK 41,666 to Mah
      Edmund
6     Approve Remuneration of Auditors        For       For          Management
7     Approve Remuneration Policy And Other   For       For          Management
      Terms of Employment For Executive
      Management


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TEMIR CAPITAL BV

Ticker:                      Security ID:  87973TAA4
Meeting Date: MAR 31, 2010   Meeting Type: Bondholder
Record Date:  FEB 23, 2010

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Approve Extraordinary Resolution Re:    For       For          Management
      (i) Restructuring Plan, (ii) Instruct
      Trustee to Vote Principal Amount of
      Notes Outstanding For Restructuring
      Plan at Creditors' Meeting, (iii)
      Instruct Trustee to Accelerate Notes
      and Demand Payment Under Guarantee

========== END NPX REPORT