Exhibit 24

POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, or Amy C. Becker the undersigned’s attorneys-in-fact and agents for the purpose of signing in the undersigned’s name and on the undersigned’s behalf as a Director of Donaldson Company, Inc., a report on Form 10-K for the Annual Report for Fiscal Year 2008, pursuant to Section 13 or 15(d) of the Securities Act of 1934, of Donaldson Company, Inc., and any and all amendments thereto, and to deliver on the undersigned’s behalf said report so signed for filing with the Securities and Exchange Commission.

Dated: September 26, 2008

/s/ F. Guillaume Bastiaens

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F. Guillaume Bastiaens

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POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, or Amy C. Becker the undersigned’s attorneys-in-fact and agents for the purpose of signing in the undersigned’s name and on the undersigned’s behalf as a Director of Donaldson Company, Inc., a report on Form 10-K for the Annual Report for Fiscal Year 2008, pursuant to Section 13 or 15(d) of the Securities Act of 1934, of Donaldson Company, Inc., and any and all amendments thereto, and to deliver on the undersigned’s behalf said report so signed for filing with the Securities and Exchange Commission.

Dated: September 26, 2008

/s/ Janet M. Dolan

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Janet M. Dolan

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POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, or Amy C. Becker the undersigned’s attorneys-in-fact and agents for the purpose of signing in the undersigned’s name and on the undersigned’s behalf as a Director of Donaldson Company, Inc., a report on Form 10-K for the Annual Report for Fiscal Year 2008, pursuant to Section 13 or 15(d) of the Securities Act of 1934, of Donaldson Company, Inc., and any and all amendments thereto, and to deliver on the undersigned’s behalf said report so signed for filing with the Securities and Exchange Commission.

Dated: September 26, 2008

/s/ Jack W. Eugster

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Jack W. Eugster

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POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, or Amy C. Becker the undersigned’s attorneys-in-fact and agents for the purpose of signing in the undersigned’s name and on the undersigned’s behalf as a Director of Donaldson Company, Inc., a report on Form 10-K for the Annual Report for Fiscal Year 2008, pursuant to Section 13 or 15(d) of the Securities Act of 1934, of Donaldson Company, Inc., and any and all amendments thereto, and to deliver on the undersigned’s behalf said report so signed for filing with the Securities and Exchange Commission.

Dated: September 26, 2008

/s/ John F. Grundhofer

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John F. Grundhofer

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POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, or Amy C. Becker the undersigned’s attorneys-in-fact and agents for the purpose of signing in the undersigned’s name and on the undersigned’s behalf as a Director of Donaldson Company, Inc., a report on Form 10-K for the Annual Report for Fiscal Year 2008, pursuant to Section 13 or 15(d) of the Securities Act of 1934, of Donaldson Company, Inc., and any and all amendments thereto, and to deliver on the undersigned’s behalf said report so signed for filing with the Securities and Exchange Commission.

Dated: September 26, 2008

/s/ Michael J. Hoffman

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Michael J. Hoffman

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POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, or Amy C. Becker the undersigned’s attorneys-in-fact and agents for the purpose of signing in the undersigned’s name and on the undersigned’s behalf as a Director of Donaldson Company, Inc., a report on Form 10-K for the Annual Report for Fiscal Year 2008, pursuant to Section 13 or 15(d) of the Securities Act of 1934, of Donaldson Company, Inc., and any and all amendments thereto, and to deliver on the undersigned’s behalf said report so signed for filing with the Securities and Exchange Commission.

Dated: September 26, 2008

/s/ Paul David Miller

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Paul David Miller

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POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, or Amy C. Becker the undersigned’s attorneys-in-fact and agents for the purpose of signing in the undersigned’s name and on the undersigned’s behalf as a Director of Donaldson Company, Inc., a report on Form 10-K for the Annual Report for Fiscal Year 2008, pursuant to Section 13 or 15(d) of the Securities Act of 1934, of Donaldson Company, Inc., and any and all amendments thereto, and to deliver on the undersigned’s behalf said report so signed for filing with the Securities and Exchange Commission.

Dated: September 26, 2008

/s/ Jeffrey Noddle

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Jeffrey Noddle

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POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, or Amy C. Becker the undersigned’s attorneys-in-fact and agents for the purpose of signing in the undersigned’s name and on the undersigned’s behalf as a Director of Donaldson Company, Inc., a report on Form 10-K for the Annual Report for Fiscal Year 2008, pursuant to Section 13 or 15(d) of the Securities Act of 1934, of Donaldson Company, Inc., and any and all amendments thereto, and to deliver on the undersigned’s behalf said report so signed for filing with the Securities and Exchange Commission.

Dated: September 26, 2008

/s/ Willard D. Oberton

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Willard D. Oberton

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POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, or Amy C. Becker the undersigned’s attorneys-in-fact and agents for the purpose of signing in the undersigned’s name and on the undersigned’s behalf as a Director of Donaldson Company, Inc., a report on Form 10-K for the Annual Report for Fiscal Year 2008, pursuant to Section 13 or 15(d) of the Securities Act of 1934, of Donaldson Company, Inc., and any and all amendments thereto, and to deliver on the undersigned’s behalf said report so signed for filing with the Securities and Exchange Commission.

Dated: September 26, 2008

/s/ John P. Wiehoff

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John P. Wiehoff

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