EXHIBIT 32.1

                            ACCOMPANYING CERTIFICATE
            PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

            Not Filed Pursuant to the Securities Exchange Act of 1934

      The undersigned Chief Executive Officer of Harvest Natural Resources, Inc.
(the "Company") does hereby certify as follows:

      This report on Form 10-Q of Harvest Natural Resources, Inc. for the period
ended June 30, 2005 and filed with the Securities and Exchange Commission on the
date hereof (the "Report") fully complies with the requirements of Section 13(a)
or 15(d) of the Securities Exchange Act of 1934 and the information contained in
the Report fairly presents, in all material respects, the financial condition
and results of operations of the Company.

Dated: August 1, 2005                      By: /s/ Peter J. Hill
                                           -------------------------------------
                                           Peter J. Hill
                                           President and Chief Executive Officer