Pricing Supplement No. 9      Dated September 12, 2003          Filed Pursuant to: Rule 424 (b)(3)
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(To Prospectus dated June 28, 2000 and                  File No.:  333-38756
Prospectus Supplement dated October 26, 2000)


                              BANK ONE CORPORATION
                           MEDIUM-TERM NOTES, SERIES C


                                                    
Date of Issue: September 17, 2003    [_] Fixed Rate    [_] Commercial Paper Rate Note  [_] LIBOR Reuters
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                                     [X] Senior        [_] Federal Funds Rate Note     [X] LIBOR Telerate
Maturity Date: September 15, 2006    [_] Subordinated  [_] CD Rate Note                [_] Prime Rate
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Note
                                     [_] CMT Rate Note [_] Treasury Rate Note          [_] LIBOR Note
                                                                                       [_] Other


CUSIP: 06422NHH2
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ISIN: US06422NHH2
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Principal Amount: $325,000,000.00
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Issue Price (As a Percentage of Principal Amount): 100%
                                                  ------------------------------

Interest Rate/Initial Interest Rate:  Not Available
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Interest Payment Dates: 15/th/ of December, March, June and September, modified
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                            following business day convention
                            ---------------------------------

Interest Reset Dates: 15/th/ of December, March, June and September, modified
                      ----------------------------------------------------------
                            following business day convention
                            ---------------------------------

Index Maturity:   90 days
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Designated CMT Maturity Index: _________________________________________________

Designated CMT Telerate Page:

Spread:  +11 Basis Points
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Ranking: Senior, unsubordinated
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Spread Multiplier: None
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Minimum Interest Rate: None
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Maximum Interest Rate: None
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Interest Payment Period: September 17, 2003 to December 15, 2003 and quarterly
                         -----------------------------------------------------
                          thereafter, up to but excluding the interest payment
                          ----------------------------------------------------
                          date
                          ----

Interest Rate Reset Period: September 17, 2003 to December 15, 2003 and
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                             quarterly thereafter, up to but excluding the
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                             interest payment date
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Redemption Date(s) or Period: The notes are not subject to redemption prior to
                              ------------------------------------------------
                               maturity
                               --------

Optional Repayment Date(s): None
                           -----------------------------------------------------

Calculation Agent (If Applicable): Bank One, NA
                                   ------------



Agents                           Principal Amount to be Purchased
------                           --------------------------------

Banc One Capital Markets                  $271,000,000.00

Fifth Third Securities, Inc.              $  2,000,000.00

SunTrust Securities, Inc.                 $  2,000,000.00

HSBC Securities (USA) Inc.                $ 50,000,000.00


Agents Capacity          [_] As agent        [X] As principal

[_] The notes are being offered at varying prices related to prevailing market
prices at the time of sale

[X] The notes are being offered at a fixed initial public offering price equal
to the Issue Price (as a percentage of Principal Amount). After the initial
offering period, the issue price may be changed.

Commission or Discount:  $163,625.00

It is expected that the Notes will be delivered to investors through the
book-entry system of The Depository Trust Co. for the accounts of its
participants, including Clearstream, Luxembourg and the Euroclear System, on
September 17, 2003.

Additional Terms:

This Pricing Supplement may be used by Banc One Capital Markets, Inc. ("BOCM"),
a wholly owned subsidiary of the issuer, in connection with offer and sales
related to secondary market transactions in the Notes. BOCM may act as principal
or agent in such transactions. Such sales will be made at prices related to the
prevailing market prices at the time of sale.

On June 15, 2002, Arthur Andersen LLP ("Arthur Andersen"), Bank One
Corporation's former independent public accountants, was convicted of federal
obstruction of justice. Bank One decided to no longer engage Arthur Andersen as
its principal accountants in 2001 and selected KPMG LLP to serve as its
independent public accountants for fiscal 2001. Arthur Andersen audited Bank
One's financial statements for the fiscal year ended December 31, 1999 and
December 31, 2000. As a result, you may have no effective remedy against Arthur
Andersen in connection with a material misstatement or omission in those
financial statements, particularly in the event that Arthur Andersen ceases to
exist or becomes insolvent as a result of the conviction or other proceedings
against it.

The SEC has provided regulatory relief pursuant to Rule 437a under the
Securities Act of 1933, as amended (the "Securities Act"), that is designed to
allow companies that file reports with the SEC to dispense with the requirement
to file a consent of Arthur Andersen in certain circumstances. We were unable to
obtain, after reasonable efforts, the written consent of Arthur Andersen to our
naming it as an expert and as having audited our financial statements
incorporated by reference into this prospectus. Because Arthur Andersen has not
provided its consent, you may not be able to recover against Arthur Andersen
under Section 11 of the Securities Act for any untrue statement of a material
fact contained in the financial statements audited by Arthur Andersen or any
omissions to state a material fact required to be stated in those financial
statements.