Consent of Independent Registered Public Accounting Firm

EX-23.1 2 dex231.htm CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM Consent of Independent Registered Public Accounting Firm

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 333-83676 of ManTech International Corporation on Form S-8 of our report dated July 6, 2006, appearing in this Annual Report on Form 11-K of the ManTech International 401(k) Plan for the year ended December 31, 2005.

/s/ DELOITTE & TOUCHE LLP

McLean, Virginia

July 6, 2006