William Tanner may refer to:
People William Tanner (politician) (1851–1938), New Zealand politician William G. Tanner (1930–2007), American academic and Southern Baptist pastor Dooee Tanner (William Henry Tanner, 1871–1938), Australian rugby union player William Tanner (cricketer) (1841–?), English cricketer William Elam Tanner (1836 –1898), Lieutenant Colonel, politician, and businessman William Tanner (MP for Bletchingley)
Fictional people Bill Tanner, character in the James Bond franchise Dr. Bill Tanner, a villain from the Alex Rider novel Snakehead Willie Tanner, husband and father of the Tanner family in the TV series ALF