The Walter A. Haas School of Business, better known as the Haas School of Business or simply Haas, is one of 14 schools and colleges at the University of California, Berkeley.

The College of Commerce was founded in 1898, making it the third oldest collegiate business school in the United States and the first at a public university. The Department of Business Administration was established in 1942. In 1943, the School of Business Administration was established to replace the College of Commerce. It was renamed in 1989 in honor of Walter A. Haas, Sr. The Haas family has donated $23.75 million, which at the time was the largest donation in Berkeley's history, to Haas School of Business. As of 2003-2004, it has 160 faculty members and 1680 students in six academic degree programs. Dean Tom Campbell, a former Congressman and California State Senator, has recently returned from his stint as the state's Director of Finance. Prof. Richard Lyons was the Acting Dean.