UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 27, 2008

GRAN TIERRA ENERGY INC.

(Exact name of Registrant as specified in its charter)
Nevada
98-0479924
(State or other jurisdiction of incorporation)
(I.R.S. Employer Identification No.)

Commission file number: 000-52594

300, 611 - 10th Avenue S.W.
Calgary, Alberta, Canada T2R 0B2
(Address of principal executive offices and zip code)

Registrant's telephone number, including area code: (403) 265-3221

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
 
 
 
 
 
 


Item 7.01 Regulation FD Disclosure.

On May 27, 2008, Gran Tierra Energy Inc. filed its Annual Information Form (AIF) for the Fiscal Year ended December 31, 2007, with the System for Electronic Document and Retrieval (SEDAR), the electronic system for filing Canadian disclosure documents. A copy of the AIF is furnished as an exhibit to this Form 8-K.

Item 9.01. Financial Statements and Exhibits.

Exhibit No.
  
Description
     
99.1
  
Annual Information Form for the Fiscal Year ended December 31, 2007.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
 
 
 
Dated May 27, 2008
GRAN TIERRA ENERGY INC
 
 
 
 
 
 
By:
/s/ Martin H. Eden 
 
   
Martin H. Eden    
  
 
 
Chief Financial Officer
 

 
 
 

EXHIBIT INDEX

 
Description
     
99.1
  
Annual Information Form for the Fiscal Year ended December 31, 2007.