EX-23.1 3 mmc12312023ex_231.htm CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in Registration Statements on Form S-8 (Registration File Nos. 2-58660, 33-48807, 33-59603, 333-176084, 333-146400, 333-229776, 333-209684, 333-226429, 333-226431, 333-240223), Registration Statement on Form S-3 (Registration File No. 333-258194) and Registration Statement on Form S-4 (Registration File No. 333-163405) of our reports dated February 12, 2024, relating to the consolidated financial statements of Marsh & McLennan Companies, Inc. and subsidiaries (the “Company”), and the effectiveness of the Company’s internal control over financial reporting, appearing in this Annual Report on Form 10-K for the year ended December 31, 2023.
/s/ Deloitte & Touche LLP
New York, New York
February 12, 2024