Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0104
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
  Nightingale Duncan
 2. Date of Event Requiring Statement (Month/Day/Year)
08/17/2011		 3. Issuer Name and Ticker or Trading Symbol
GRAN TIERRA ENERGY, INC. [GTE]
(Last)
(First)
(Middle)
C/O GRAN TIERRA ENERGY INC., 300, 625 11TH AVENUE SW		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Pres., GTE Colombia
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

CALGARY, A0 T2R 0E1		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Options (Rt to Buy) 09/08/2010(1)(2) 09/08/2019 Common Stock 166,667 $ 3.95 D  
Stock Option (Rt to Buy) 03/03/2011(1) 03/03/2020 Common Stock 30,000 $ 5.9 D  
Stock Option (Rt to Buy) 03/09/2012(1) 03/09/2021 Common Stock 50,000 $ 8.4 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Nightingale Duncan
C/O GRAN TIERRA ENERGY INC.
300, 625 11TH AVENUE SW
CALGARY, A0 T2R 0E1		       Pres., GTE Colombia  

Signatures

/s/Sonya Messner, Attorney-In-Fact 08/25/2011
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Option shares shall vest in a series of three equal consecutive annual installments commencing on the first anniversary of the vesting commencement date until fully-vested.
(2) 83,333 shares subject to this option vested on 9/8/10 and the option as to these shares was subsequently exercised and the shares sold.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.