Exhibit

We consent to the incorporation by reference in the registration statements (Registration Statement Nos. 333-84498, 333-33972, 333-37634, 333-41717, 333-70091, 333-74591, 333-74727, 333-74879, 333-84349, 333-90931, 333-108063, 333-115892, 333-146821, 333-159600, 333-168547, 333-188732) on Form S-8 and (Registration Statement No. 333-221896) on Form S-3 of Omnicom Group Inc. and subsidiaries of our report dated February 12, 2019, with respect to the consolidated balance sheets of Omnicom Group Inc. and subsidiaries as of December 31, 2018 and 2017, and the related consolidated statements of income, comprehensive income, equity and cash flows for each of the years in the three-year period ended December 31, 2018, and the related notes and financial statement schedule II, and the effectiveness of internal control over financial reporting as of December 31, 2018, which report appears in the December 31, 2018 Annual Report on Form 10-K of Omnicom Group Inc. and subsidiaries.