EXHIBIT 23
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
Omnicom Group Retirement Savings Plan
New York, New York
We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-74591) of Omnicom Group Inc. of our report dated June 30, 2025 relating to the financial statements and supplemental schedules of the Omnicom Group Retirement Savings Plan, which appears in this Annual Report on Form 11-K.
/s/ PKF O'Connor Davies, LLP
Harrison, New York
June 30, 2025