Exhibit 24

POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, Amy C. Becker and each of them, 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 2006, 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 30, 2006

/s/ F.Guillaume Bastiaens

Signature

F. Guillaume Bastiaens

Print Name

POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, Amy C. Becker and each of them, 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 2006, 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 30, 2006

/s/ Janet M. Dolan

Signature

Janet M. Dolan

Print Name

POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, Amy C. Becker and each of them, 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 2006, 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 30, 2006

/s/ Jack W. Eugster

Signature

Jack W. Eugster

Print Name

POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, Amy C. Becker and each of them, 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 2006, 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 30, 2006

/s/ John F. Grundhofer

Signature

John F. Grundhofer

Print Name

POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, Amy C. Becker and each of them, 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 2006, 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 30, 2006

/s/ Michael J. Hoffman

Signature

Michael J. Hoffman

Print Name

POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, Amy C. Becker and each of them, 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 2006, 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 30, 2006

/s/ Paul David Miller

Signature

Paul David Miller

Print Name

POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, Amy C. Becker and each of them, 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 2006, 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 30, 2006

/s/ Jeffrey Noddle

Signature

Jeffrey Noddle

Print Name

POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, Amy C. Becker and each of them, 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 2006, 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 30, 2006

/s/ Willard D. Oberton

Signature

Willard D. Oberton

Print Name

POWER OF ATTORNEY

The undersigned does hereby constitute and appoint William M. Cook, Norman C. Linnell, Amy C. Becker and each of them, 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 2006, 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 30, 2006

/s/ John P. Wiehoff

Signature

John P. Wiehoff

Print Name