SECURITIES AND EXCHANGE COMMISSION
                                          Washington, D.C. 20549

                                           --------------------

                                                 FORM 8-K

                                              CURRENT REPORT

                                 PURSUANT TO SECTION 13 OR 15(d) OF THE
                                     SECURITIES EXCHANGE ACT OF 1934


<TABLE>
<CAPTION>
<S>                                                 <C> <C>
                                             October 21, 2003
---------------------------------------------------------------------------------------------------------
                                    (Date of earliest event reported)



                                     Marsh & McLennan Companies, Inc.
                 ------------------------------------------------------------------------
                          (Exact name of registrant as specified in its charter)




              Delaware                            1-5998                           36-2668272
---------------------------------------------------------------------------------------------------------
  (State or other jurisdiction           (Commission File Number)                (IRS Employer
        of incorporation)                                                      Identification No.)



1166 Avenue of the Americas, New York, NY                                            10036
---------------------------------------------------------------------------------------------------------
(Address of principal executive offices)                                           (Zip Code)



                                               (212) 345-5000
   ---------------------------------------------------------------------------------------------------
                            (Registrant's telephone number, including area code)




</TABLE>

<PAGE>





Item 7.  Financial Statements and Exhibits.

         (a) None.

         (b) None.

         (c) Exhibits

               99.1. Press Release dated October 21, 2003.

Item 12.  Results of Operations and Financial Condition.

     On October 21, 2003, Marsh & McLennan Companies, Inc. issued a press
release announcing its unaudited third quarter financial results for the quarter
ended September 30, 2003. A copy of the press release is attached to this Report
as an exhibit and is incorporated herein by reference.



<PAGE>





                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                               MARSH & McLENNAN COMPANIES, INC.



                                               By:  /s/ Leon J. Lichter
                                                    ----------------------------
                                                    Name:   Leon J. Lichter
                                                    Title:  Vice President &
                                                             Corporate Secretary



Date:  October 22, 2003
       ----------------



<PAGE>





Exhibit Index

Exhibit (99.1): Press release dated October 21, 2003.
[{"type": "8-K", "sequence": "1", "filename": "f8koct2003.txt", "description": "CURRENT REPORT (OCTOBER 21, 2003)", "secsgml_size_bytes": 3334}]
{"company-data": {"conformed-name": "MARSH & MCLENNAN COMPANIES INC", "cik": "0000062709", "assigned-sic": "6411", "irs-number": "362668272", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-05998", "film-number": "03951792"}, "business-address": {"street1": "1166 AVENUE OF THE AMERICAS", "city": "NEW YORK", "state": "NY", "zip": "10036", "phone": "2123455000"}, "mail-address": {"street1": "1166 AVENUE OF THE AMERICAS", "city": "NEW YORK", "state": "NY", "zip": "10036"}, "former-company": {"former-conformed-name": "MARLENNAN CORP", "date-changed": "19760505"}}
SECURITIES AND EXCHANGE COMMISSION
                                          Washington, D.C. 20549

                                           --------------------

                                                 FORM 8-K

                                              CURRENT REPORT

                                 PURSUANT TO SECTION 13 OR 15(d) OF THE
                                     SECURITIES EXCHANGE ACT OF 1934
October 21, 2003
---------------------------------------------------------------------------------------------------------
                                    (Date of earliest event reported)

                                     Marsh & McLennan Companies, Inc.
                 ------------------------------------------------------------------------
                          (Exact name of registrant as specified in its charter)

              Delaware                            1-5998                           36-2668272
---------------------------------------------------------------------------------------------------------
  (State or other jurisdiction           (Commission File Number)                (IRS Employer
        of incorporation)                                                      Identification No.)

1166 Avenue of the Americas, New York, NY                                            10036
---------------------------------------------------------------------------------------------------------
(Address of principal executive offices)                                           (Zip Code)

                                               (212) 345-5000
   ---------------------------------------------------------------------------------------------------
                            (Registrant's telephone number, including area code)
Item 7.  Financial Statements and Exhibits.

         (a) None.

         (b) None.

         (c) Exhibits

               99.1. Press Release dated October 21, 2003.

Item 12.  Results of Operations and Financial Condition.

     On October 21, 2003, Marsh & McLennan Companies, Inc. issued a press
release announcing its unaudited third quarter financial results for the quarter
ended September 30, 2003. A copy of the press release is attached to this Report
as an exhibit and is incorporated herein by reference.
SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                               MARSH & McLENNAN COMPANIES, INC.

                                               By:  /s/ Leon J. Lichter
                                                    ----------------------------
                                                    Name:   Leon J. Lichter
                                                    Title:  Vice President &
                                                             Corporate Secretary

Date:  October 22, 2003
       ----------------
Exhibit Index

Exhibit (99.1): Press release dated October 21, 2003.