Exhibit 23.3


                         CONSENT OF INDEPENDENT AUDITORS


We consent to the reference to our firm under the caption "Experts" in the Proxy
Statement of ASI Solutions, Inc. that is referred to and made a part of the
Prospectus and Registration Statement (Form S-4) of Aon Corporation for the
registration of 3,852,184 shares of its common stock and to the incorporation by
reference therein of our reports dated February 8, 2001, with respect to the
consolidated financial statements of Aon Corporation incorporated by reference
in its Annual Report (Form 10-K) for the year ended December 31, 2000, and the
related financial statement schedules included therein, filed with the
Securities and Exchange Commission.


                                                          ERNST & YOUNG LLP

                                                          /s/ Ernst & Young LLP

Chicago, Illinois
March 21, 2001