EXHIBIT 23 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM The Board of Directors Computer Task Group, Incorporated: We consent to the incorporation by reference in the Registration Statements No. 33-41995, 33-50160, 33-61493, 333-12237, 333-39936, 333-51162, 333-66766, 333-91148 and 333-118314 on Form S-8 and Registration Statement No. 333-43263 on Form S-3 of Computer Task Group, Incorporated of our reports dated March 10, 2006 with respect to the consolidated balance sheets of Computer Task Group, Incorporated and subsidiaries as of December 31, 2005 and 2004, and the related consolidated statements of operations, changes in shareholders' equity, and cash flows for each of the years in the three-year period ended December 31, 2005, the related financial statement schedule, management's assessment of the effectiveness of internal control over financial reporting as of December 31, 2005, and the effectiveness of internal control over financial reporting as of December 31, 2005, which reports appear in the December 31, 2005 annual report on Form 10-K of Computer Task Group, Incorporated. /s/ KPMG LLP Buffalo, New York March 14, 2006 68