Exhibit 32.1


                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER
                                  PURSUANT TO
                            18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                 SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002


I, John Terwilliger, certify, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual
Report of Houston American Energy Corp. on Form 10-K for the year ended December
31, 2007 fully complies with the requirements of Section 13(a) or 15(d) of the
Securities Exchange Act of 1934 and that information contained in such Form 10-K
fairly presents in all material respects the financial condition and results of
operations of Houston American Energy Corp.


                                           By:  /s/ John F. Terwilliger
                                           Name: John F. Terwilliger
                                           Title:   Chief Executive Officer
                                           Dated: March 27, 2008