Deltek (PROJ) 10-Q 2010 Q3 Quarterly report

Exhibit 32.1

Certification of Principal Executive Officer and Principal Financial Officer

Pursuant to 18 U.S.C. Section 1350,

as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

I, Kevin T. Parker, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of Deltek, Inc. on Form 10-Q for the quarterly period ended September 30, 2010 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Deltek, Inc.

Date: November 9, 2010	/s/ KEVIN T. PARKER
	Kevin T. Parker
	Chairman, President and Chief Executive Officer
	(Principal Executive Officer)

I, Michael P. Corkery, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of Deltek, Inc. on Form 10-Q for the quarterly period ended September 30, 2010 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Deltek, Inc.

Date: November 9, 2010	/s/ MICHAEL P. CORKERY
	Michael P. Corkery
	Executive Vice President, Chief Financial Officer and Treasurer
	(Principal Financial Officer)