Exhibit 23



CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the previously filed
Registration Statements 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,
333-69774 and 333-107195) and previously filed Registration Statements on Form
S-3 (Registration File No. 333-67543 and 333-108566) and the previously filed
Registration Statements on Form S-4 (Registration File Nos. 33-24124 and
333-87510) of our reports dated March 7, 2005, relating to the financial
statements of Marsh & McLennan Companies, Inc. and subsidiaries, and
management's report on the effectiveness of internal control over financial
reporting appearing in the Annual Report on Form 10-K of Marsh & McLennan
Companies, Inc. and subsidiaries for the year ended December 31, 2004 and to the
references to us under the heading "Experts" in the Prospectuses which form part
of the aforementioned Registration Statements.




/s/ Deloitte & Touche LLP


New York, New York
March 7, 2005