William or Bill Steele may refer to:
- Bill Steele (baseball) (1885–1949), pitcher in Major League Baseball
- Bill Steele (cave explorer) (born 1948 as Charles William Steele), American speleologist
- Bill Steele (ice hockey) (born 1952), ice hockey player in the World Hockey Association
- Bill Steele (sailor) (born 1940), Hong Kong Olympic sailor
- Billy Steele (born 1956), Scottish former footballer
- William Steele (actor) (1888–1966), American actor
- William Steele (Confederate general) (1819–1885), American Army officer and Confederate general
- William Steele (Lord Chancellor of Ireland) (1610–1680), Lord Chancellor of Ireland
- William Steele (Pittsburgh), Chief Burgess of the Borough of Pittsburgh, 1812–1813, see list of mayors of Pittsburgh
- William Steele (rugby union) (born 1947), former Scotland international rugby union player
- Willie Steele (William Samuel Steele, 1923–1989), American athlete
- William A. Steele, a character in the serial Ace of Spades
- William Steele (Australian Army officer) (1895–1966), Australian Army general
- William Steele (cricketer) (born 1946), South African cricketer
- William B. Steele (born 1929), United States Army general
- William G. Steele (1820–1892), American Democratic Party politician
- William H. Steele (New York politician) (1838 –1911), American lawyer and politician
- William H. Steele (judge) (born 1951), American jurist
- William H. Steele (Wisconsin politician) (1872–1955), American politician
- William H. Steele (United States Army officer) (born c. 1955), military officer and former commander of Camp Cropper, a holding facility for security detainees in Iraq
- William L. Steele (1875–1949), American architect, mainly in Iowa, Illinois, but briefly in Pittsburgh, Pennsylvania
- William Steele (1839–1908), architect of William Steele & Sons Company, in Philadelphia, Pennsylvania
- William M. Steele, General Officer in the U.S. Army
- William O. Steele (1917–1979), American author
- William Randolph Steele (1842–1901), Delegate from the Territory of Wyoming