Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in this Registration Statement on Form S-8 and related Prospectus of Heidrick & Struggles International, Inc. of our report dated February 24, 2020, relating to the consolidated financial statements and the effectiveness of internal control over financial reporting of Heidrick & Struggles International, Inc., appearing in the Annual Report on Form 10-K of Heidrick & Struggles International, Inc. for the year ended December 31, 2019.

/s/ RSM US LLP

Chicago, Illinois

June 22, 2020

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