William Fuller may refer to:
Politics
William K. Fuller (1792–1883), U.S. Representative from New York
William E. Fuller (1846–1918), U.S. Representative from Iowa
William H. Fuller (1876–1943), state legislator in Pennsylvania
Sports
William Fuller (athlete) (1904–?), Canadian Olympic sprinter
Bill Fuller (footballer) (born 1944), defender for Crystal Palace F.C.
William Fuller (American football) (born 1962), American football defensive end
William Fuller (baseball) (1889–?), American baseball player
William Fuller (rugby union) (1883–1957), New Zealand rugby union player
Will Fuller (born 1994), American football wide receiver
William "Homer" Fuller (1920–2007), American professional basketball player
Other
Willie H. Fuller (1919–1995), Tuskegee Airman
William Fuller (priest) (c. 1580–1659), dean of Ely
William Fuller (bishop) (1608–1675), bishop of Lincoln
Captain William Fuller (16??–1695), English-born leader of the Puritan forces in the Battle of the Severn and Puritan governor of Maryland
William Fuller (imposter) (1670–1733), English impostor
William Fuller (banker) (1705–1800), English benefactor of nonconformist causes
William Allen Fuller (1836–1905), conductor on the Western & Atlantic Railroad during the American Civil War era
Chief William Fuller (1873–1958), Miwok Indian Chief, see Tuolumne County, California
William Charles Fuller (1884–1974), VC recipient
William Fuller (poet) (born 1953), U.S. poet