Exhibit 24



DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall
& Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i) executing in his name and on his behalf Marshall
& Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall &
Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the
attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 19th day of February, 2004.



/s/ Richard A. AbdooRichard A. Abdoo




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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 19th day of February, 2004.



/s/ David L. AndreasDavid L. Andreas




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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 26th day of February, 2004.



/s/ Andrew N. BaurAndrew N. Baur




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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 26th day of February, 2004.



/s/ Jon F. ChaitJon F. Chait




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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 19th day of February, 2004.



/s/ Bruce E. JacobsBruce E. Jacobs




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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 19th day of February, 2004.



/s/ Donald R. JohnsonDonald R. Johnson




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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 19th day of February, 2004.



/s/ Ted D. KellnerTed D. Kellner




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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 19th day of February, 2004.



/s/ Dennis J. KuesterDennis J. Kuester






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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 24th day of February, 2004.



/s/ Katharine C. LyallKatharine C. Lyall






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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 19th day of February, 2004.



/s/ Edward L. Meyer, Jr.Edward L. Meyer, Jr.






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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 19th day of February, 2004.



/s/ San W. Orr, Jr.San W. Orr, Jr.




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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 24th day of February, 2004.



/s/ Robert J. OTooleRobert J. OToole




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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 19th day of February, 2004.



/s/ Peter M. Platten, IIIPeter M. Platten, III






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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 19th day of February, 2004.



/s/ Robert A. SchaeferRobert A. Schaefer






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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 26th day of February, 2004.



/s/ John S. ShielyJohn S. Shiely






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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 19th day of February, 2004.



/s/ James A. UrdanJames A. Urdan




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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 19th day of February, 2004.



/s/ George E. WardebergGeorge E. Wardeberg




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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 19th day of February, 2004.



/s/ James B. WigdaleJames B. Wigdale




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DIRECTORS POWER OF ATTORNEY

(2003 Form 10-K)



The undersigned director of Marshall & Ilsley Corporation designates each of Dennis J. Kuester, Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of: (i)
executing in his name and on his behalf Marshall & Ilsley Corporations Form 10-K for the fiscal year ended December 31, 2003 and any related amendments and/or supplements; (ii) generally doing all things in his name and on his behalf in
his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and
confirming his signature as it may be signed by the attorney-in-fact to the Form 10-K and any related amendments and/or supplements.



Dated this 19th day of February, 2004.



/s/    John A. MellowesJohn A. Mellowes