As filed with the Securities and Exchange Commission on June 26, 2003
                                                    Registration No. 333-_______
================================================================================

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                    FORM S-8

                             REGISTRATION STATEMENT
                        UNDER THE SECURITIES ACT OF 1933

                            ARTHUR J. GALLAGHER & CO.
             (Exact Name of Registrant as specified in its Charter)

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

                   Delaware                            36-2151613
                   --------                            ----------
        (State or other jurisdiction of             (I.R.S. Employer
        incorporation or organization)             Identification No.)

                                Two Pierce Place
                           Itasca, Illinois 60143-3141
                    (Address of principal executive offices)

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

                            ARTHUR J. GALLAGHER & CO.
                          EMPLOYEE STOCK PURCHASE PLAN
                            (Full title of the plan)

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

                             JOHN C. ROSENGREN, Esq.
                       Vice President and General Counsel
                            Arthur J. Gallagher & Co.
                                Two Pierce Place
                           Itasca, Illinois 60143-3141
                                 (630) 773-3800
 (Name, address and telephone number, including area code, of agent for service)

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

                  Please Send Copies of All Communications to:
                             BRIAN J. FAHRNEY, Esq.
                           Sidley Austin Brown & Wood
                            10 South Dearborn Street
                             Chicago, Illinois 60603
                                 (312) 853-7000

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

                         CALCULATION OF REGISTRATION FEE



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 Title of Each Class of Securities to be      Amount to be          Proposed Maximum         Proposed Maximum          Amount of
                Registered                     Registered       Offering Price Per Unit  Aggregate Offering Price  Registration Fee
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         Common Stock, par value
             $1.00 per share              4,000,000 shares (1)         $28.28 (2)            $113,120,000 (2)           $9,152
------------------------------------------------------------------------------------------------------------------------------------

      Common Share Purchase Rights          4,000,000 rights              (3)                       (3)                   (3)
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(1) In addition, pursuant to Rule 416(c) under the Securities Act of 1933, this
Registration Statement also covers an indeterminate number of interests to be
offered or sold pursuant to the employee benefit plan described herein.

(2) Estimated solely for the purpose of calculating the registration fee
pursuant to Rules 457(c) and 457(h) under the Securities Act of 1933 on the
basis of the average of the high and low prices of the Common Stock on June 23,
2003, as reported on the consolidated reporting system for securities listed on
The New York Stock Exchange.

(3) Common Share Purchase Rights initially are attached to and trade with the
shares of Common Stock being registered under this registration statement. The
value attributed to such rights, if any, is reflected in the market price of the
Common Stock.

================================================================================



                                     PART II
               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. Incorporation of Certain Documents by Reference.

     The following documents heretofore filed with the Securities and Exchange
Commission (the "Commission") by Arthur J. Gallagher & Co. (the "Company") are
incorporated herein by reference:

     (a) The Company's Annual Report on Form 10-K for the fiscal year ended
December 31, 2002 filed under the Securities Exchange Act of 1934, as amended
(the "Exchange Act");

     (b) The Company's Quarterly Report on Form 10-Q for the fiscal quarter
ended March 31, 2003 filed under the Exchange Act;

     (c) The Company's Current Report on Form 8-K filed on June 25, 2003 under
the Exchange Act; and

     (d) The description of the common stock, $1.00 par value, of the Company
(the "Common Stock") contained in the Company's registration statement on Form
8-A, filed with the Commission on October 22, 1987, and the description of
common share purchase rights currently attached to the common stock contained in
the Company's registration statement on Form 8-A, filed with the Commission on
November 2, 1987, including any amendment or report filed for the purpose of
updating such descriptions.

     All documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act, after the date of this registration statement and
prior to the filing of a post-effective amendment which indicates that all
securities offered hereby have been sold or which deregisters all securities
then remaining unsold, are deemed to be incorporated by reference into this
registration statement and to be a part hereof from the respective dates of
filing of such documents (such documents, and the documents enumerated above,
being hereinafter referred to as "Incorporated Documents").

     Any statement contained in an Incorporated Document shall be deemed to be
modified or superseded for purposes of this registration statement to the extent
that a statement contained herein or in any other subsequently filed
Incorporated Document modifies or supersedes such statement. Any such statement
so modified or superseded shall not be deemed, except as so modified or
superseded, to constitute a part of this registration statement.

Item 4. Description of Securities.

        Not applicable.

Item 5. Interests of Named Experts and Counsel.

     Certain legal matters in connection with this offering will be passed upon
for the Company by John C. Rosengren, Esq., Vice President and General Counsel
of the Company. As of June 26, 2003, Mr. Rosengren beneficially owns 5,446
shares of the Common Stock and has current exercisable options to purchase
19,300 shares of Common Stock.



Item 6. Indemnification of Directors and Officers.

     Article Seventh of the Company's By-laws and Article Thirteenth of the
Company's Restated Certificate of Incorporation provide for indemnification of
each of the Company's directors, officers, employees or agents to the fullest
extent permitted by the Delaware General Corporation Law.

     Article Seventh of the Company's By-laws provides that the Company shall
indemnify any person in connection with any action, suit, or proceeding brought
or threatened by reason of the fact that he or she is or was one of the Company
directors, officers, employees or agents, or is or was serving at the Company's
request as a director, officer, employee or agent of another enterprise, against
all costs actually and reasonably incurred by him or her in connection with such
action, suit or proceeding if he or she acted in good faith and in a manner he
or she reasonably believed to be in or not opposed to the Company's best
interests, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his or her conduct was unlawful. Similar indemnity
is permitted to be provided to such persons in connection with an action or suit
by the Company or in the Company's right, and provided further that such person
shall not have been adjudged liable for negligence or misconduct in the
performance of his or her duty to the Company, unless, in view of all the
circumstances of the case, the court in which the action or suit was brought
determines that such person despite the adjudication of liability is fairly and
reasonably entitled to indemnity for such expenses.

     Article Thirteenth of the Company's Restated Certificate of Incorporation
eliminates the liability of the Company's directors for monetary damages for
breach of fiduciary duty as a director except where a director breaches his or
her duty of loyalty to the Company and the Company's stockholders, fails to act
in good faith or engages in intentional misconduct or a knowing violation of
law, authorizes the payment of a dividend or stock repurchase which is illegal
under Section 174 of the Delaware General Corporation Laws or obtains an
improper personal benefit.

     The Company also maintains and pays premiums on a directors' and officers'
liability insurance policy and has entered into an indemnity agreement with each
of the Company's directors and officers. The provisions of the indemnity
agreement alter or clarify the statutory indemnity in the following respects:
(1) indemnity will be explicitly provided for settlements in derivative actions;
(2) prompt payment of litigation expenses will be provided in advance of
indemnification; (3) prompt indemnification of advances of expenses will be
provided unless a determination is made that the director or officer has not met
the required standard; (4) the director or officer will be permitted to petition
a court to determine whether his actions meet the standards required; and (5)
partial indemnification will be permitted in the event that the director or
officer is not entitled to full indemnification. In addition, the indemnity
agreement specifically includes indemnification with respect to actions, suits
or proceedings brought under and/or predicated upon the Securities Act of 1933
and/or the Exchange Act.

     The preceding summary is qualified in its entirety by reference to the
Company's Restated Certificate of Incorporation, By-laws and the indemnity
agreement.

Item 7. Exemption from Registration Claimed.

        Not applicable.

Item 8. Exhibits.

The following exhibits are filed herewith or incorporated by reference as part
of this Registration Statement:



Exhibit
Number   Description of Exhibit
------   ----------------------

4.1      Restated Certificate of Incorporation of the Company (incorporated by
         reference to Exhibit 3.1 to the Company's Quarterly Report on Form 10-Q
         for the quarterly period ended June 30, 1996, File No. 1-9761).

4.1.1    Certificate of Amendment of Restated Certificate of Incorporation of
         the Company, Amended as of May 18, 2000 (incorporated by reference to
         Exhibit 3.1.1 to the Company's Quarterly Report on Form 10-Q for the
         quarterly period ended June 30, 2000, File No. 1-9761).

4.1.2    Certificate of Amendment of Restated Certificate of Incorporation of
         the Company, Amended as of May 23, 2001 (incorporated by reference to
         Exhibit 3.1.2 to the Company's Quarterly Report on Form 10-Q for the
         quarterly period ended June 30, 2001, File No. 1-9761).

4.2      Bylaws of the Company (incorporated by reference to Exhibit 3.2 to the
         Company's Form S-1 Registration Statement No. 33-10447).

4.3      Rights Agreement between the Company and Bank of America Illinois
         (formerly Continental Illinois National Bank and Trust Company of
         Chicago) (incorporated by reference to Exhibits 1 and 2 to Gallagher's
         Form 8-A Registration Statement filed May 12, 1987, File No. 0-13480).

4.4      Assignment and Assumption Agreement of Rights Agreement by and among
         Bank of America Illinois (formerly Continental Illinois National Bank
         and Trust Company of Chicago), Harris Trust and Savings Bank and the
         Company (incorporated by reference to Exhibit 3.4 to the Company's Form
         S-8 Registration Statement No. 33-38031).

4.5      Amendment No. 1 to Exhibit 4.3 (incorporated by reference to Exhibit
         3.3 to the Company's Quarterly Report on Form 10-Q for the quarterly
         period ended June 30, 1996, File No. 1-9761).

5.0*     Opinion of John C. Rosengren, Esq., Vice President and General Counsel
         of the Company as to the legality of the securities being registered.

23.1*    Consent of Ernst & Young LLP.

23.2*    Consent of John C. Rosengren, Esq., Vice President and General Counsel
         of the Company (included in the opinion filed as Exhibit 5.0).

24.0*    Powers of Attorney.

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

*    Filed herewith.



Item 9. Undertakings.

     (a) The undersigned registrant hereby undertakes:

     (1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:

     (i) To include any prospectus required by Section 10(a)(3) of the
Securities Act of 1933, as amended (the "Securities Act");

     (ii) To reflect in the prospectus any facts or events arising after the
effective date of the registration statement (or the most recent post-effective
amendment thereof) which, individually or in the aggregate, represent a
fundamental change in the information set forth in the registration statement.
Notwithstanding the foregoing, any increase or decrease in volume of securities
offered (if the total dollar value of securities offered would not exceed that
which was registered) and any deviation from the low or high end of the
estimated maximum offering range may be reflected in the form of prospectus
filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the
changes in volume and price represent no more than a 20 percent change in the
maximum aggregate offering price set forth in the "Calculation of Registration
Fee" table in the effective registration statement; and

     (iii) To include any material information with respect to the plan of
distribution not previously disclosed in the registration statement or any
material change to such information in the registration statement;

provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
registration statement is on Form S-3, Form S-8 or Form F-3, and the information
required to be included in a post-effective amendment by those paragraphs is
contained in periodic reports filed with or furnished to the Commission by the
registrant pursuant to Section 13 or 15(d) of the Exchange Act that are
incorporated by reference in the registration statement.

     (2) That, for the purpose of determining any liability under the Securities
Act, each such post-effective amendment shall be deemed to be a new registration
statement relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering
thereof.

     (3) To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering.

     (b) The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the registration statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

     (c) Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Commission such indemnification is
against public policy as expressed in the Securities Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by the registrant of expenses incurred or
paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final
adjudication of such issue.



                                   Signatures

     The Registrant. Pursuant to the requirements of the Securities Act of 1933,
the Company certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-8 and has duly caused this
registration statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Itasca, State of Illinois, on this 26/th/ day of
June, 2003.

                                      Arthur J. Gallagher & Co.

                                      By:  /s/ J. Patrick Gallagher, Jr.
                                          --------------------------------------
                                           J. Patrick Gallagher, Jr.
                                           President and Chief Executive Officer

     Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities indicated on this 26/th/ day of June, 2003.

Names                            Title
-----                            -----

/s/ Robert E. Gallagher*         Chairman and Director
-----------------------------
Robert E. Gallagher

/s/ J. Patrick Gallagher, Jr.    President, Chief Executive Officer and Director
-----------------------------    (Principal Executive Officer)
J. Patrick Gallagher, Jr.

/s/ Douglas K. Howell            Vice President and Chief Financial Officer
-----------------------------    (Principal Financial Officer)
Douglas K. Howell

/s/ Richard C. Cary              Controller (Principal Accounting Officer)
-----------------------------
Richard C. Cary

/s/ James J. Braniff III*        Director
-----------------------------
James J. Braniff III

/s/ T. Kimball Brooker*           Director
-----------------------------
T. Kimball Brooker

/s/ Gary P. Coughlan*            Director
-----------------------------
Gary P. Coughlan

/s/ James W. Durkin, Jr.*        Director
-----------------------------
James W. Durkin, Jr.

/s/ Ilene S. Gordon*             Director
-----------------------------
Ilene S. Gordon



/s/ Elbert O. Hand*                  Director
----------------------------
Elbert O. Hand

/s/ David E. McGurn, Jr.*            Director
----------------------------
David E. McGurn, Jr.

/s/ Richard J. McKenna*              Director
----------------------------
Richard J. McKenna


*By:  /s/ John C. Rosengren
    --------------------------
    John C. Rosengren
    Attorney-in-Fact

     The Plan. Pursuant to the requirements of the Securities Act of 1933, the
Company trustees (or other persons who administer the employee benefit plan)
have duly caused this registration statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Itasca, State of
Illinois, on this 26/th/ day of June, 2003.

                          Arthur J. Gallagher & Co. Employee Stock Purchase Plan

                          By:  /s/ Elizabeth J. Brinkerhoff
                             ------------------------------
                          Name: Elizabeth J. Brinkerhoff
                          Title: Vice President - Human Resources



             Index to Exhibits to Registration Statement on Form S-8

Exhibit
Number   Description of Exhibit
------   ----------------------

4.1      Restated Certificate of Incorporation of the Company (incorporated by
         reference to Exhibit 3.1 to the Company's Quarterly Report on Form 10-Q
         for the quarterly period ended June 30, 1996, File No. 1-9761).

4.1.1    Certificate of Amendment of Restated Certificate of Incorporation of
         the Company, Amended as of May 18, 2000 (incorporated by reference to
         Exhibit 3.1.1 to the Company's Quarterly Report on Form 10-Q for the
         quarterly period ended June 30, 2000, File No. 1-9761).

4.1.2    Certificate of Amendment of Restated Certificate of Incorporation of
         the Company, Amended as of May 23, 2001 (incorporated by reference to
         Exhibit 3.1.2 to the Company's Quarterly Report on Form 10-Q for the
         quarterly period ended June 30, 2001, File No. 1-9761).

4.2      Bylaws of the Company (incorporated by reference to Exhibit 3.2 to the
         Company's Form S-1 Registration Statement No. 33-10447).

4.3      Rights Agreement between the Company and Bank of America Illinois
         (formerly Continental Illinois National Bank and Trust Company of
         Chicago) (incorporated by reference to Exhibits 1 and 2 to Gallagher's
         Form 8-A Registration Statement filed May 12, 1987, File No. 0-13480).

4.4      Assignment and Assumption Agreement of Rights Agreement by and among
         Bank of America Illinois (formerly Continental Illinois National Bank
         and Trust Company of Chicago), Harris Trust and Savings Bank and the
         Company (incorporated by reference to Exhibit 3.4 to the Company's Form
         S-8 Registration Statement No. 33-38031).

4.5      Amendment No. 1 to Exhibit 4.3 (incorporated by reference to Exhibit
         3.3 to the Company's Quarterly Report on Form 10-Q for the quarterly
         period ended June 30, 1996, File No. 1-9761).

5.0*     Opinion of John C. Rosengren, Esq., Vice President and General Counsel
         of the Company as to the legality of the securities being registered.

23.1*    Consent of Ernst & Young LLP.

23.2*    Consent of John C. Rosengren, Esq., Vice President and General Counsel
         of the Company (included in the opinion filed as Exhibit 5.0).

24.0*    Powers of Attorney.

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

*    Filed herewith.