UNITED STATES
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

Date of report (Date of earliest event reported): March 26, 2012

Aon Corporation

(Exact Name of Registrant as Specified in Charter)

Delaware		1-7933		36-3051915
(State or Other Jurisdiction of Incorporation)		(Commission File Number)		(IRS Employer Identification No.)

200 East Randolph Street, Chicago, Illinois
(Address of Principal Executive Offices)

60601
(Zip Code)

Registrant’s telephone number, including area code: (312) 381-1000

Not Applicable
(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 5.02.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

(b) On March 26, 2012, Andrew J. McKenna informed Aon Corporation (the “Company”) of his decision to resign from the Company’s Board of Directors, effective at the close of business on March 30, 2012. Mr. McKenna’s decision to resign as a director was not due to any disagreements with the Company on any matter relating to the Company’s operations, policies or practices.

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.

	Aon Corporation

	By:	/s/ Ram Padmanabhan
		Ram Padmanabhan
		Vice President, Chief Counsel — Corporate and Corporate Secretary

Date: March 30, 2012