Kerr Mcgee 10-Q 2005 Q2 Quarterly report

Exhibit 32.1

KERR-McGEE CORPORATION

123 Robert S. Kerr Avenue

Oklahoma City, Oklahoma 73102

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 Quarterly report on Form 10-Q for the period that ended June 30, 2005 as filed with the Securities and Exchange Commission (the "Report") that:

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

·   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

______________________

Luke R. Corbett

Chief Executive Officer

August 8, 2005