Powers of Attorney

KNOW ALL MEN BY THESE PRESENTS, THAT I, Frederick H. Waddell, hereby constitute and appoint William A. Osborn, Steven L. Fradkin, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ Frederick H. Waddell

Frederick H. Waddell

President, Chief Executive Officer and Director

KNOW ALL MEN BY THESE PRESENTS, THAT I, Steven L. Fradkin, hereby constitute and appoint William A. Osborn, Frederick H. Waddell, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ Steven L. Fradkin

Steven L. Fradkin

Executive Vice President and Chief Financial Officer

KNOW ALL MEN BY THESE PRESENTS, THAT I, Aileen B. Blake, hereby constitute and appoint William A. Osborn, Frederick H. Waddell, Steven L. Fradkin, and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ Aileen B. Blake

Aileen B. Blake

Executive Vice President and Controller

(Chief Accounting Officer)

KNOW ALL MEN BY THESE PRESENTS, THAT I, William A. Osborn, hereby constitute and appoint Frederick H. Waddell, Steven L. Fradkin, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ William A. Osborn

William A. Osborn

Chairman of the Board and Director

KNOW ALL MEN BY THESE PRESENTS, THAT I, Linda Walker Bynoe, hereby constitute and appoint William A. Osborn, Frederick H. Waddell, Steven L. Fradkin, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ Linda Walker Bynoe

Linda Walker Bynoe

Director

KNOW ALL MEN BY THESE PRESENTS, THAT I, Nicholas D. Chabraja, hereby constitute and appoint William A. Osborn, Frederick H. Waddell, Steven L. Fradkin, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ Nicholas D. Chabraja

Nicholas D. Chabraja

Director

KNOW ALL MEN BY THESE PRESENTS, THAT I, Susan Crown, hereby constitute and appoint William A. Osborn, Frederick H. Waddell, Steven L. Fradkin, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ Susan Crown

Susan Crown

Director

KNOW ALL MEN BY THESE PRESENTS, THAT I, Dipak C. Jain, hereby constitute and appoint William A. Osborn, Frederick H. Waddell, Steven L. Fradkin, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ Dipak C. Jain

Dipak C. Jain

Director

KNOW ALL MEN BY THESE PRESENTS, THAT I, Arthur L. Kelly, hereby constitute and appoint William A. Osborn, Frederick H. Waddell, Steven L. Fradkin, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ Arthur L. Kelly

Arthur L. Kelly

Director

KNOW ALL MEN BY THESE PRESENTS, THAT I, Robert C. McCormack, hereby constitute and appoint William A. Osborn, Frederick H. Waddell, Steven L. Fradkin, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ Robert C. McCormack

Robert C. McCormack

Director

KNOW ALL MEN BY THESE PRESENTS, THAT I, Edward J. Mooney, hereby constitute and appoint William A. Osborn, Frederick H. Waddell, Steven L. Fradkin, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ Edward J. Mooney

Edward J. Mooney

Director

KNOW ALL MEN BY THESE PRESENTS, THAT I, John W. Rowe, hereby constitute and appoint William A. Osborn, Frederick H. Waddell, Steven L. Fradkin, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ John W. Rowe

John W. Rowe

Director

KNOW ALL MEN BY THESE PRESENTS, THAT I, Harold B. Smith, hereby constitute and appoint William A. Osborn, Frederick H. Waddell, Steven L. Fradkin, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ Harold B. Smith

Harold B. Smith

Director

KNOW ALL MEN BY THESE PRESENTS, THAT I, William D. Smithburg, hereby constitute and appoint William A. Osborn, Frederick H. Waddell, Steven L. Fradkin, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ William D. Smithburg

William D. Smithburg

Director

KNOW ALL MEN BY THESE PRESENTS, THAT I, Enrique J. Sosa, hereby constitute and appoint William A. Osborn, Frederick H. Waddell, Steven L. Fradkin, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ Enrique J. Sosa

Enrique J. Sosa

Director

KNOW ALL MEN BY THESE PRESENTS, THAT I, Charles A. Tribbett III, hereby constitute and appoint William A. Osborn, Frederick H. Waddell, Steven L. Fradkin, Aileen B. Blake and William R. Dodds, Jr., or any of them, with full power of substitution and resubstitution my true and lawful attorneys and agents with full power to them, and each of them singly, to execute in my name and on my behalf in all capacities indicated below the Registration Statement on Form S-3 of Northern Trust Corporation, and any amendments and supplements thereto, to be filed with the Securities and Exchange Commission and generally to do all such things in my name and on my behalf in all capacities indicated below to enable Northern Trust Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission.

I hereby ratify and confirm all that said attorneys, or any of them, have done or shall lawfully do by virtue of this Power of Attorney.

/s/ Charles A. Tribbett III

Charles A. Tribbett III

Director