William Howard Taft (1857–1930) was the president of the United States from 1909 to 1913.
William Taft may also refer to:
- William Howard Taft II (1887-1952), son of Henry Waters Taft and nephew of President William Howard Taft
- William Howard Taft III (1915–1991), Son of Robert A Taft U.S. Ambassador to Ireland
- William Howard Taft IV (born 1945), U.S. Deputy Secretary of Defense
- William W. Taft (born 1932), American politician, former member of the Ohio Senate
- Bill Taft (born 1965), American rock musician