Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We hereby consent to the incorporation by reference in the following Registration Statements:
Form |
| Number |
| Purpose |
S-8 |
| 33-27984 |
| Pertaining to Aon’s savings plan |
S-8 |
| 33-42575 |
| Pertaining to Aon’s stock award plan and stock option plan |
S-8 |
| 33-59037 |
| Pertaining to Aon’s stock award plan and stock option plan |
S-8 |
| 333-55773 |
| Pertaining to Aon’s stock award plan, stock option plan, and employee stock purchase plan |
S-8 |
| 333-103344 |
| Pertaining to registration of common stock |
S-8 |
| 333-106584 |
| Pertaining to Aon’s deferred compensation plan |
S-8 |
| 333-145928 |
| Pertaining to registration of common stock |
S-8 |
| 333-145930 |
| Pertaining to the registration of common stock underlying equity securities issued to Aon’s president and chief executive officer |
S-3 |
| 333-159841 |
| Pertaining to the registration of debt securities, preferred stock, common stock, convertible securities, share purchase contracts, share purchase units and guarantees |
of Aon Corporation of our report dated May 11, 2011, with respect to the consolidated financial statements of Hewitt Associates, Inc. for the year ended September 30, 2010, in the Current Report on Form 8-K of Aon Corporation dated May 24, 2011, and to the reference to our firm under the heading “Experts” in any prospectus supplement to the prospectus dated June 8, 2009 included in the Registration Statement on Form S-3 (No. 333-159841) of Aon Corporation.
| /s/ Ernst & Young LLP |
| Ernst & Young LLP |
|
|
Chicago, Illinois |
|
May 24, 2011 |
|