Brett D. White (650) 843-5191 whitebd@cooley.com VIA EDGAR

October 16, 2008

H. Roger Schwall

Assistant Director

Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Re: Gran Tierra Energy Inc.

Registration Statement on Form S-3

File No. 333-153376

Filed September 9, 2008

Dear Mr. Schwall:

Attached on behalf of Gran Tierra Energy Inc. (“Gran Tierra”), pursuant to the request of Sean Donahue of the staff (the “Staff”) of the Securities and Exchange Commission (the “Commission”), are the pages of proposed changes to the above-referenced registration statement that were sent by facsimile transmission to the Staff on October 15, 2008.

Please call me at (650) 843-5191 should you have any questions regarding this matter.

Sincerely,

/s/ Brett White

Brett White

Attachment

cc: Dana Coffield, Chief Executive Officer and President, Gran Tierra Energy Inc.

Martin Eden, Chief Financial Officer, Gran Tierra Energy Inc.

Nancy Wojtas, Cooley Godward Kronish LLP