July 30, 2019

Gary S. Guidry
President and Chief Executive Officer
Gran Tierra Energy Inc.
900, 520-3 Avenue SW
Calgary, Alberta Canada T2P 0R3

       Re: Gran Tierra Energy Inc.
           Form 10-K for the Fiscal Year ended December 31, 2018
           Filed February 27, 2019
           File No.: 001-34018

Dear Mr. Guidry:

       We have reviewed your filing and have the following comments. In some of
our
comments, we may ask you to provide us with information so we may better
understand your
disclosure.

       Please respond to these comments within ten business days by providing
the requested
information or advise us as soon as possible when you will respond. If you do
not believe our
comments apply to your facts and circumstances, please tell us why in your
response.

       After reviewing your response to these comments, we may have additional
comments.

Form 10-K for the Fiscal Year ended December 31, 2018

Business and Properties
Estimated Reserves, page 10

1.    The discussion of probable and possible reserves refers to various
circumstances identified
      in the definitions under Rule 4-10(a)(18) and (a)(17) of Regulation S-X,
respectively,
      under which such reserves may be assigned. Expand your disclosure to
further explain the
      extent to which one or more of the factors you have identified apply to
the probable and
      possible reserves disclosed as of December 31, 2018. Refer to the
disclosure requirements
      in Item 1202(a)(5) of Regulation S-K.
2.    Expand your discussion of the uncertainty relating to probable and
possible reserves to
      incorporate appropriate cautionary language indicating estimates of
probable and possible
      reserves (i) are more uncertain than proved reserves, (ii) have not been
adjusted for risk
      attributable to that uncertainty, and (iii) may not be comparable with
each other and
      should not be summed arithmetically with each other or with estimates for
proved
 Gary S. Guidry
FirstName LastNameGary S. Guidry
Gran Tierra Energy Inc.
Comapany NameGran Tierra Energy Inc.
July 30, 2019
July 30, 2019 Page 2
Page 2
FirstName LastName
         reserves. Refer to Item 1202(a)(5) of Regulation S-K and the
Compliance and Disclosure
         Interpretation Question 105.01.
Proved Undeveloped Reserves, page 11

3.       Expand your disclosure of the changes in the net quantities of proved
undeveloped
         reserves to include an explanation of the material changes related to
each line item shown
         in your reconciliation. To the extent that two or more unrelated
factors are combined to
         arrive at the line item figure, your disclosure should separately
identify and quantify each
         individual factor that contributed to a material change so that the
change in net reserves
         between periods is fully explained.

         The disclosure of revisions in the previous estimates of reserves in
particular should
         identify such factors as changes caused by commodity prices, well
performance,
         unsuccessful and/or uneconomic proved undeveloped locations or the
removal of proved
         undeveloped locations due to changes in a previously adopted
development plan. Refer to
         Item 1203(b) of Regulation S-K.

         This comment also applies to the disclosure provided as part of the
Supplementary Data
         (Unaudited) on page 78 relating to the significant changes in the net
quantities of total
         proved reserves for each line item shown in the reconciliation, other
than production, and
         for each of the periods presented. Refer to FASB ASC 932-235-50-5.
Developed and Undeveloped Acreage, page 12

4.       Expand the disclosure of your acreage to discuss the expiration dates
of material amounts
         of your undeveloped acreage. Refer to the disclosure requirements
under Item 1208(b) of
         Regulation S-K.
5.       Expand your disclosure to indicate the extent to which you have
assigned any proved
         undeveloped reserves to locations which are currently scheduled to be
drilled after
         expiration of the related acreage. If there are material quantities of
net proved
         undeveloped reserves relating to such locations, also describe the
steps that will be
         necessary to extend the time to the expiration of such acreage.
Production, Revenue and Price History, page 12

6.       Expand your disclosure of production and average sales prices, to
include for the
         Costayaco, Moqueta and Acordionero fields, and any other fields that
contain 15% or
         more of your total proved reserves, the net quantities of natural gas
production and the
         related gas sales prices for each of the last three fiscal years.
Refer to the disclosure
         requirements under Item 1204(a) of Regulation S-K.
7.       Your tabular disclosure of production and price history appears to be
limited to
         information relating specifically to the Costayaco, Moqueta and
Acordionero fields.
 Gary S. Guidry
Gran Tierra Energy Inc.
July 30, 2019
Page 3
         Expand your tabulation to present comparable figures for the total
aggregate amounts of
         production, by final product sold of oil and natural gas, relating to
all of your producing
         assets, for each of the last three fiscal years. Refer to the
disclosure requirements under
         Item 1204(a) of Regulation S-K.
8.       The tabular presentation of production for the Costayaco, Moqueta and
Acordionero fields
         and the preceding discussion indicates the figures shown in the table
include both oil and
         NGL production. However, footnote 1 to your reconciliation of the
changes in total
         proved reserves on page 34 indicates liquids reserves, and by
extension the production
         figures, for all periods are 100% oil. Revise your disclosure of
production on page 12 to
         reconcile the apparent inconsistency in the description of your
liquids production, or tell
         us why a revision is not necessary.
Financial Statements
Supplementary Data (Unaudited), page 77

9.       We note that you have provided a roll-forward of acquisition,
exploration and
         development costs in your tabulation on page 79, including balances
reflecting the
         summation of such costs as of December 31, 2015, 2016, 2017 and 2018.
However, the
         balances that you report do not coincide with the amounts that you
report in Note 5 on
         page 63, which appear to be those you present in conformity with U.S.
GAAP.

         As the disclosure requirements outlined in FASB ASC 932-235-50-17
through 20 include
         amounts that may or may not be capitalized, and do not encompass DD&A,
ceiling-test
         write-downs, impairments, or other adjustments to capitalized costs,
please clarify the
         nature of the balances that you report.

         Please observe the summary nature of this disclosure requirement,
without vertical
         summations or balances in the illustration at FASB ASC 932-235-55-4.
        We remind you that the company and its management are responsible for
the accuracy
and adequacy of their disclosures, notwithstanding any review, comments, action
or absence of
action by the staff.

        You may contact John Hodgin, Petroleum Engineer, at (202) 551-3699 with
questions
regarding engineering comments. Please contact Joseph Klinko at (202) 551-3824
or Karl
Hiller, Accounting Branch Chief at (202) 551-3686 with any other questions.



FirstName LastNameGary S. Guidry                               Sincerely,
Comapany NameGran Tierra Energy Inc.
                                                               Division of
Corporation Finance
July 30, 2019 Page 3                                           Office of
Natural Resources
FirstName LastName