Chaparral Energy (CHAP) 10-Q 2007 Q2 Quarterly report

Exhibit 32.1

CERTIFICATION BY CHIEF EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Chaparral Energy, Inc. (the “Company”) on Form 10-Q for the period ending June 30, 2007 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Mark A. Fischer, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, to my knowledge, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ Mark A. Fischer

Mark A. Fischer

Chief Executive Officer

Date: August 13, 2007