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. 333-255374 on Form S-8 of our report dated March 8, 2022, relating to the financial statements of DoubleVerify Holdings, Inc. appearing in this Annual Report on Form 10-K for the year ended December 31, 2021.

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/s/ Deloitte & Touch LLP

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New York, NY

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March 8, 2022