EXHIBIT 32.1


                               APACHE CORPORATION

                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER
                           AND CHIEF FINANCIAL OFFICER



         I, G. Steven Farris, certify that the Quarterly Report of Apache
Corporation on Form 10-Q for the quarterly period ending September 30, 2003,
fully complies with the requirements of Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 (15 U.S.C. ss.78m or ss.78o (d)) and that information
contained in such report fairly represents, in all material respects, the
financial condition and results of operations of Apache Corporation.



/s/ G. Steven Farris
-------------------------------------------
By:     G. Steven Farris
Title:  President, Chief Executive Officer
        and Chief Operating Officer




         I, Roger B. Plank, certify that the Quarterly Report of Apache
Corporation on Form 10-Q for the quarterly period ending September 30, 2003,
fully complies with the requirements of Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 (15 U.S.C. ss.78m or ss.78o (d)) and that information
contained in such report fairly represents, in all material respects, the
financial condition and results of operations of Apache Corporation.



/s/ Roger B. Plank
--------------------------------------------
By:     Roger B. Plank
Title:  Executive Vice President
        and Chief Financial Officer