William Henry Danforth II (April 10, 1926[1] – September 16, 2020)[2] was an American physician, professor of medicine, academic administrator, and philanthropist. He was chancellor of Washington University in St. Louis from 1971 until 1995. Danforth was the grandson of Ralston-Purina founder and St. Louis businessman William H. Danforth, and the brother of former U.S. Senator John Danforth.