March 28, 2007


VIA EDGAR
- ---------
Securities and Exchange Commission
Division of Corporation Finance
100 F Street, N.E.
Washington, D.C. 20549

Attention: Cecilia D. Blye

     RE:  SEC Comment Letter, dated February 21, 2007
          Willis Group Holdings Limited
          Form 10-K for Fiscal Year Ended December 31, 2005
          Filed March 28, 2006
          File No. 1-16503

Dear Ms. Dye:

On behalf of Willis Group Holdings Limited, a Bermuda corporation (the
"Company"), please find the Company's response to the comment letter to Patrick
Regan of the Company, dated February 21, 2007 from the Staff of the Securities
and Exchange Commission (the "Commission") relating to the above referenced Form
10-K (the "2005 10-K").

For reference purposes, the Staff's comments as reflected in the Staff's letter
of February 21, 2007, are reproduced in boldface text in numerical sequence in
this letter, and the response of the Company are shown in plain text below.


General -
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1.   The "Global Retail Network" section of your website lists an office in Iran
     with a staff of 25. That section of your website also states that your
     offices in Egypt "can also assist in Sudan...." Iran and Sudan are
     identified by the U.S. as state sponsors of terrorism and are subject to
     U.S. economic sanctions and export controls. Your Form 10-K does not
     include any information on your business in Iran or Sudan. Please describe
     for us your past, current, and any anticipated operations in, and other
     contacts with, Iran and Sudan, whether through direct or indirect
     arrangements. In your description, describe the insurance products and
     services that are provided into Iran and Sudan. Your response should
     describe any agreements, commercial arrangements or other contacts with the
     governments of Iran and Sudan or entities controlled by those governments.




2.   Please discuss the materiality of the activities and other contacts
     described in response to the foregoing comment, and whether they constitute
     a material investment risk for your security holders. You should address
     materiality in quantitative terms, including the approximate dollar amounts
     of any associated revenues, assets, and liabilities for the last three
     fiscal years and any subsequent period. Please also address materiality in
     terms of qualitative factors that a reasonable investor would deem
     important in making an investment decision, including the potential impact
     of corporate activities upon a company's reputation and share value.

     For example, we note that Arizona and Louisiana have adopted legislation
     requiring their state retirement systems to prepare reports regarding state
     pension fund assets invested in, and/or permitting divestment of state
     pension fund assets from, companies that do business with countries
     identified as state sponsors of terrorism. The Missouri Investment Trust
     has established an equity fund for the investment of certain state-held
     monies that screens out stocks of companies that do business with
     U.S.-designated state sponsors of terrorism. The Pennsylvania legislature
     has adopted a resolution directing its Legislative Budget and Finance
     Committee to report annually to the General Assembly regarding state funds
     invested in companies that have ties to terrorist-sponsoring countries.
     California, Connecticut, Illinois, Maine, Oregon and New Jersey have
     adopted, and other states are considering, legislation prohibiting the
     investment of certain state assets in, and/or requiring the divestment of
     certain state assets from, companies that do business with Sudan. Harvard
     University, Stanford University, Yale University, the University of
     California, and other academic institutions have adopted policies
     prohibiting investment in, and/or requiring divestment from, companies that
     do business with Sudan. Your materiality analysis should address the
     potential impact of the investor sentiment evidenced by such actions
     directed toward companies that have operations associated with Iran and
     Sudan.

     Your qualitative materiality analysis also should address whether, and the
     extent to which, the Iranian and Sudanese governments or entities
     controlled by those governments have received cash or acted as
     intermediaries in connection with your operations.

Willis is committed to complying with all applicable laws and regulations,
including the US law that is the subject of your comments. In order to respond
to your comments, we have conducted a review of the operations of both the
Company's US and non-US subsidiaries.

The Company provides insurance brokerage, reinsurance and risk management
consulting services to clients located in approximately 190 countries. These
clients include major multinational and middle-market companies in a variety of
industries, as well as public institutions and individual clients. In our
capacity as an advisor and broker, we act as an intermediary between our clients
and the insurance and reinsurance markets, helping our clients determine the
means of managing risk, and negotiating and placing insurance risks with
insurance or reinsurance markets.


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Upon receipt of your letter, the Company immediately reviewed its website and
determined that our website incorrectly contained references to an office and
staff in Iran. The Iranian office referred to on the website was not a Willis or
Willis subsidiary office, but the office of an unaffiliated broker to whom some
of the Company's non-US subsidiaries have referred clients from time to time.
Inasmuch as the reference to an office in Iran was erroneous, we immediately
removed this reference from our website on February 22, 2007. With respect to
Sudan, neither the Company nor any of its subsidiaries maintains an office or
other physical presence in Sudan.

As you requested, we also reviewed our contacts with Iran and Sudan. Our review
resulted in a finding that some non-US subsidiaries of the Company received
approximately $2.8 million of income with respect to insurance coverages placed
on behalf of both private and government- owned Iranian clients in 2004,
approximately $1.7 million in 2005 and approximately $2.4 million in 2006. In
addition, non-US subsidiaries of the Company placed insurance coverage for these
clients with insurers or reinsurers domiciled in Iran of approximately $400,000
in 2004, $1.3 million in 2005, and $1.2 million in 2006. We have used our best
efforts to identify insurers owned by the Iranian government and we believe
that, of these amounts, we placed approximately $250,000 in 2004, $275,000 in
2005, and $116,000 in 2006 with insurance or reinsurance companies domiciled in
Iran that were owned in whole or in part by the Iranian government.

With respect to Sudan, non-US subsidiaries of the Company received on behalf of
Sudanese clients approximately $1 million in income with respect to insurance
coverages placed in 2004, $550,000 in 2005, and $874,000 in 2006. In addition,
non-US subsidiaries of the Company received approximately $100,000 in income
with respect to a non-Sudanese client with operations in Sudan. Approximately $1
million in 2004, $550,000 in 2005, and $874,000 in 2006 of these revenue amounts
were for Sudanese clients owned in whole or part by the Sudanese government. To
the best of our knowledge, no insurance coverage was placed with insurers or
reinsurers owned by the Sudanese government. Based on our review, any
compensation paid to the Company's non-US subsidiaries with respect to any
insurance coverage placed for Iranian or Sudanese clients would have been paid
out of the premium charged by the client's insurers or reinsurers.

To the best of our belief, there are no written agreements with any Iranian
clients and only one agreement between a non-US subsidiary of the company and an
international client's branch in Sudan. All other clients in Iran or Sudan, as
with any client that does not have a written agreement with the Company, would
have been provided a copy of the general terms upon which the applicable non-US
subsidiary does business. The total revenue received with respect to insurance
coverages placed on behalf of Iranian and Sudanese clients for each of these
years constituted less than two-tenths of one percent of total revenues for the
Company for each of those years.


                                  Page 3 of 5



In connection with our review and after careful consideration, the Company has
determined that neither the Company nor any of its subsidiaries will be
permitted to maintain an office or other physical presence in Iran or Sudan or
enter into any agreement to provide services for the Iranian or Sudanese
governments or Iranian or Sudanese-owned business entities. The Company's non-US
subsidiaries are commencing an orderly termination of this business in
accordance with this policy. To the extent some of our other clients may
occasionally conduct activities in Iran or Sudan, any services would be provided
by non-US subsidiaries of the Company in accordance with applicable law.

The Company has considered both quantitative and non-quantitative factors, such
as the impact of such business activities on the Company's reputation and share
value, with respect to its business activities of its non-US subsidiaries with
Iranian and Sudanese clients. As discussed above, the activities are not
quantitatively material to the financial statements of the Company and we do not
believe these activities are likely to be viewed by investors as qualitatively
material. In addition, as described above, the Company is adopting a policy
ceasing the aforementioned activities in those countries. From 2001 through
2007, the Company's common stock has traded on The New York Stock Exchange. In
addition, the Company's US subsidiary is currently an issuer of $1.2 billion in
principal amount of debt securities that the Company believes are widely held by
a variety of institutional and individual investors. Given the limited amount of
revenues and the fact that we are ceasing the aforementioned activities, the
Company believes that investors are not likely to view this as important in
making an investment decision regarding the Company's securities.

The Company is aware of the legislation and guidelines referred to by the Staff
that have been adopted by certain states and organizations permitting or
requiring divestment from, or reporting of interest in, companies that do
business with certain US designated state sponsors of terrorism. We do not
believe that such legislation has, to date, had a material impact on our
reputation or share value. We will continue to monitor the status of this
legislation, as well as legislation proposed, but not yet enacted by several
other states, and whether it may have any material impact on the Company and its
security holders.

It is the Company's practice to consult with and obtain legal advice from
outside counsel experienced in matters of United States law relating to
sanctions, embargoes and similar restrictions regarding countries that may be
viewed as state sponsors of terrorism or be otherwise subject to trade
restrictions.


                                  Page 4 of 5



Company acknowledges that it is responsible for the adequacy and accuracy of the
disclosure in the filings; Securities & Exchange Commission (the "Commission")
staff comments or changes to disclosure in response to staff comments do not
foreclose the Commission from taking any action with respect to the Company's
filings; and the Company may not assert staff comments as a defense in any
proceeding initiated by the Commission or any person under the federal
securities laws of the United States.

Sincerely,

/s/ Adam G. Ciongoli

Adam G. Ciongoli
General Counsel


cc:  Jeffrey Riedler
     Pradip Bhaumik


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