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):    February 23, 2001

                             BANK ONE CORPORATION
            (Exact name of registrant as specified in its charter)

        Delaware                          001-15323             31-0738296
(State or other jurisdiction      (Commission File Number)  (IRS Employer
   of incorporation)                                       Identification No.)

1 Bank One Plaza, Chicago, IL                                  60670
(Address of principal executive offices)                    (Zip Code)

       Registrant's telephone number, including area code:   312-732-4000



Item 4.  Changes in Registrant's Certifying Accountant
------

(a)  The Registrant has decided to no longer engage Arthur Andersen LLP ("AA")
     as its principal accountant and has selected KPMG LLP ("KPMG") to serve as
     its principal accountant for 2001.  The change in accountants was
     recommended by the Audit and Risk Management Committee of the Registrant's
     Board of Directors and approved by the Board on February 23, 2001.

     AA's report on each of the Registrant's 1998 and 1999 financial statements
     did not contain an adverse opinion or a disclaimer of opinion, and was not
     qualified as to uncertainty, audit scope or accounting principles. AA's
     report on the Registrant's 2000 financial statements has not yet been
     issued, but is expected to be issued in March, 2001, in conjunction with
     the filing of the Registrant's Annual Report on Form 10-K for the year
     ended December 31, 2000. During 1998, 1999 and 2000, and during the portion
     of 2001 preceding the Board's decision, there were no disagreements with AA
     on any matter of accounting principles or practices, financial statement
     disclosure, or auditing scope or procedure, which disagreement(s), if not
     resolved to AA's satisfaction, would have caused it to refer to the subject
     matter of the disagreement(s) in connection with its reports; and there
     were no reportable events ("Reportable Events") as described in Item
     304(a)(1)(v) of the Securities and Exchange Commission's (the "Commission")
     Regulation S-K.

     The Registrant has provided a copy of the foregoing statements to AA.
     Attached as Exhibit 99(a) hereto is AA's letter to the Commission stating
     its agreement with such statements.


(b)  Effective February 23, 2001, the Registrant has engaged KPMG as its
     principal accountant for 2001.  During 1999 and 2000, and during the
     portion of 2001 preceding the Board's decision, neither the Registrant nor
     anyone acting on its behalf consulted with KPMG regarding (i) either the
     application of accounting principles to a specified transaction, either
     completed or proposed, or the type of audit opinion that might be rendered
     on the Registrant's financial statements;  or (ii) any matter that was
     either the subject of a disagreement with AA or a Reportable Event with
     respect to AA.


Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits
------

(c)  Exhibits.

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

  99(a)             Letter from Arthur Andersen LLP to the Securities and
                    Exchange Commission, dated February 23, 2001.



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.



                                       BANK ONE CORPORATION
                                           (Registrant)


Date:  February 23, 2001               By:  /s/ M. Eileen Kennedy
      --------------------                 --------------------------------
                                             Title: Treasurer

                                      -2-


                                 EXHIBIT INDEX



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


99(a)             Letter from Arthur Andersen LLP to the Securities and Exchange
                  Commission, dated February 23, 2001.

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