Exhibit 32.1


KERR-McGEE CORPORATION
Kerr-McGee Center
Oklahoma City, Oklahoma 73125


                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER
                      REGARDING PERIODIC REPORT CONTAINING
                              FINANCIAL STATEMENTS


I, Luke R. Corbett,  the Chief Executive Officer of Kerr-McGee  Corporation (the
"Issuer"),  in compliance  with 18 U.S.C.  Section 1350, as adopted  pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002, hereby certify in connection with
the Issuer's  Annual Report on Form 10-K for the period that ended  December 31,
2003 as filed with the Securities and Exchange Commission (the "Report") that:

       o  the Report fully  complies with the  requirements  of Section 13(a) of
          the Securities Exchange Act of 1934; and

       o  information  contained in the Report fairly presents,  in all material
          respects,  the  financial  condition  and results of operations of the
          Issuer.


/s/ Luke R. Corbett
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Luke R. Corbett
Chief Executive Officer
March 11, 2004