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


      The undersigned hereby certify, pursuant to 18 U.S.C. Section 1350, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to
the undersigned's best knowledge and belief, the Quarterly Report on Form
10-Q for the Geodyne Energy Income Limited Partnership III-A ("Issuer") for
the period ending June 30, 2003 as filed with the Securities and Exchange
Commission on the date hereof (the "Report"):

      (a)   fully complies with the requirements of section 13(a) or 15(d) of
            the Securities Exchange Act of 1934; and
      (b)   the information contained in the Report fairly presents, in all
            material respects, the financial condition and results of
            operations of the Issuer.

      Dated this 13th day of August, 2003.

                                    GEODYNE ENERGY INCOME LIMITED
                                    PARTNERSHIP III-A
                                    ("Issuer")

                                    //s// Dennis R. Neill
                                    -----------------------------------
                                    Dennis R. Neill
                                    President (Chief Executive Officer)

                                    //s// Craig D. Loseke
                                    -----------------------------------
                                    Craig D. Loseke
                                    Chief Accounting Officer
                                    (Chief Financial Officer)

      A signed original of this written statement  required by Section 906 has
been furnished to Geodyne Energy Income Limited  Partnership III-A and will be
retained by Geodyne Energy Income Limited  Partnership  III-A and furnished to
the Securities and Exchange Commission or its staff upon request.