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                             March 16, 2023

       Mark McGivney
       Chief Financial Officer
       Marsh & McLennan Companies, Inc.
       1166 Avenue of the Americas
       New York, New York 10036

                                                        Re: Marsh & McLennan
Companies, Inc.
                                                            Form 10-K for
Fiscal Year Ended December 31, 2022
                                                            File No. 001-05998

       Dear Mark McGivney:

              We have limited our review of your filing to the financial
statements and related
       disclosures and have the following comments. In some of our comments, we
may ask you to
       provide us with information so we may better understand your disclosure.

              Please respond to these comments within ten business days by
providing the requested
       information or advise us as soon as possible when you will respond. If
you do not believe our
       comments apply to your facts and circumstances, please tell us why in
your response.

                                                        After reviewing your
response to these comments, we may have additional comments.

       Form 10-K for Fiscal Year Ended December 31, 2022

       Consolidated Revenue and Expense, page 43

   1.                                                   We note the prominence
and significance of your references to trends in underlying
                                                        revenue throughout your
MD&A, in your earnings press release included in Form 8-K
                                                        filed on January 26,
2023 and your related earnings conference call. We further note your
                                                        disclosure on page 43
that underlying revenue measures the change in revenue by
                                                        isolating certain noted
items. Please revise future periodic filings to disclose the amount
                                                        of underlying revenue
(in total, by segment, etc.) for each period presented, provide a
                                                        reconciliation
detailing the calculation of underlying revenue and clearly label the
                                                        measures as non-GAAP.
Refer to Item 10(e) of Regulation S-K for guidance and other
                                                        disclosure
requirements. Please provide us your proposed disclosure.
   2.                                                   We note you quantify
and attribute the change in revenue between periods to the impact of
                                                        foreign currency
exchange fluctuations throughout your MD&A. Please tell us in detail
                                                        and revise future
filings to clarify how you quantify the impact of foreign currency
                                                        exchange fluctuations.
Please consider providing us a simplified example showing the
 Mark McGivney
Marsh & McLennan Companies, Inc.
March 16, 2023
Page 2
         calculation.
Consolidated Balance Sheets, page 62

3.       We note disclosure on page 70 related to presenting cash and cash
equivalents held in a
         fiduciary capacity as a contra-liability on your balance sheet, since
they are not available
         for corporate use. Please tell us the accounting guidance you
considered in determining
         your presentation and specifically how you determined that cash and
cash equivalents held
         in a fiduciary capacity should not be presented as assets.
Note 1. Summary of Significant Accounting Policies, page 65

4.       Noting the significance of the impact of foreign currency translation
on your financial
         results, please revise future filings to disclose your accounting
policies used to translate
         foreign currency statements. Refer to ASC 830 for guidance.
       In closing, we remind you that the company and its management are
responsible for the
accuracy and adequacy of their disclosures, notwithstanding any review,
comments, action or
absence of action by the staff.

       You may contact John Spitz at (202) 551-3484 or Michael Volley at (202)
551-3437 with
any questions.



FirstName LastNameMark McGivney                                 Sincerely,
Comapany NameMarsh & McLennan Companies, Inc.
                                                                Division of
Corporation Finance
March 16, 2023 Page 2                                           Office of
Finance
FirstName LastName