Exhibit 99.1

FOR IMMEDIATE RELEASE: Friday, July 29, 2011 FOR FURTHER INFORMATION: Rich Sheffer (952) 887-3753

DONALDSON COMPANY DECLARES QUARTERLY CASH DIVIDEND

MINNEAPOLIS, July 29, 2011-- Donaldson Company, Inc. (NYSE: DCI), announced today that its Board of Directors declared a regular cash dividend of 15 cents per share, payable September 16^th to shareholders of record as of August 24^th. As of June 30^th, there were approximately 75,500,000 shares outstanding.

The current declaration is the 224^th consecutive quarterly cash dividend paid by Donaldson over a time span of 56 years.

About Donaldson Company, Inc.

Donaldson is a leading worldwide provider of filtration systems that improve people’s lives, enhance our Customers’ equipment performance, and protect our environment. We are a technology-driven Company committed to satisfying our Customers’ needs for filtration solutions through innovative research and development, application expertise, and global presence. Our 12,800 employees contribute to the Company’s success by supporting our Customers at our more than 100 sales, manufacturing, and distribution locations around the world.

Donaldson is a member of the S&P MidCap 400 and Russell 1000 indices, and our shares trade on the NYSE under the symbol DCI. Additional information is available at www.donaldson.com.

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