Exhibit 23.1

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CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

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We consent to the incorporation by reference in Registration Statement No. 333-267676 on Form S-3 and Registration Statement No. 333-255374 on Form S-8 of our reports dated March 1, 2023, relating to the consolidated financial statements of DoubleVerify Holdings, Inc. and the effectiveness of DoubleVerify Holdings, Inc.’s internal control over financial reporting appearing in this Annual Report on Form 10-K for the year ended December 31, 2022.

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/s/ Deloitte & Touche LLP

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New York, New York

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March 1, 2023