FORM 4 Check this box if no longer subject to Section 16.  Form 4 or Form 5 obligations may continue. See Instruction 1(b). (Print or Type Responses)	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C.  20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL
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 1. Name and Address of Reporting Person *

RYAN               PATRICK             G. (Last)            (First)              (Middle)


c/o Aon Corporate Law Department, 200 East Randolph Drive, 8th Floor (Street)


Chicago            IL            60601 (City)       (State)          (Zip)

   2. Issuer Name and Ticker
    or Trading Symbol
AON CORPORATION AOC  3. I.R.S. Identification
    Number of Reporting
    Person, if an entity
    (voluntary)

 4. Statement for
 (Month/Day/Year) 05/01/03

 5. If Amendment, Date of
   Original (Month/Day/Year)

 6. Relationship of Reporting Person(s) to Issuer (Check all applicable)

 X  Director   10% Owner  X  Officer (give title below) Chairman and Chief Executive Officer       Other (specify below)


 7. Individual or Joint/Group
     Filing (Check Applicable Line)

 X Form filed by One Reporting Person

      Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/ Year)	2A. Deemed Execution Date, if any (Month/Day/ Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock								12,960,300	D
Common Stock								365,876	I	By ESOP and Savings  Plan
Common Stock								9,951,953	I	By Spouse
Common Stock								583,942	I	By Spouse as Trustee

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/ Year)

3A. Deemed Execution Date, if any (Month/Day/ Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Securities: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Employee Stock Option (Right to Buy)

$21.9850

5/01/03

A

500,000

(1)

5/01/03

Common Stock

500,000

500,000

D

Explanation of Responses:

(1) Vesting will occur in accordance with the terms of the Aon Stock Incentive Plan as follows: 33% on each of 5/01/05 and 5/01/07; 34% on 5/01/06.

/s/ Patrick G. Ryan ** Signature of Reporting Person 05/02/03 Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations.
      See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note:   File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

http://www.sec.gov/divisions/corpfin/forms/form4.htm

Last update: 09/05/2002