Exhibit 23.01

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors

Heidrick & Struggles International, Inc.:

We consent to the incorporation by reference in the registration statements (No. 333-130143, No. 333-82424, No. 333-58118, No. 333-32544, and No. 333-73443) on Form S-8 of Heidrick & Struggles International, Inc. of our reports dated March 10, 2006, with respect to the consolidated balance sheets of Heidrick & Struggles International, Inc. as of December 31, 2005 and 2004, and the related consolidated statements of operations, stockholders’ equity and comprehensive income (loss), and cash flows for each of the years in the three-year period ended December 31, 2005, and 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 Heidrick & Struggles International, Inc.

/s/ KPMG LLP

Chicago, Illinois

March 10, 2006