Exhibit 23


                          INDEPENDENT AUDITOR'S CONSENT

We consent to the incorporation by reference in the previously filed
Registration Statements of Marsh & McLennan Companies, Inc. on Form S-8
(Registration File Nos. 2-58660, 33-32880, 33-48803, 33-48804, 33-48807,
33-54349, 33-59603, 33-63389, 333-35741, 333-35739, 333-29627, 333-41828,
333-41830, 333-41832, 333-69778, 333-69776, and 333-69774) and previously filed
Registration Statement on Form S-3 (Registration File No.333-67543) and the
previously filed Registration Statements on Form S-4 (Registration File Nos.
33-24124 and 333-87510) of our reports dated February 28, 2003 (which expresses
an unqualified opinion and includes an explanatory paragraph relating to the
adoption of Statement of Financial Accounting Standards No. 142, GOODWILL AND
OTHER INTANGIBLE ASSETS) appearing in, and incorporated by reference in, this
Annual Report on Form 10-K of Marsh & McLennan Companies, Inc. for the year
ended December 31, 2002.

DELOITTE & TOUCHE LLP

New York, New York
March 26, 2003