Exhibit 23.1

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INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM’S CONSENT

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We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-264207) of Direct Digital Holdings, Inc. (the Company) of our report dated October 15, 2024, relating to the consolidated financial statements, which appears in this Annual Report on Form 10-K. Our report contains an explanatory paragraph regarding the Company’s ability to continue as a going concern.

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/s/ BDO USA, P.C.

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New York, New York

October 15, 2024