William Fisher may refer to:

Politics, government, military

William Fisher (MP for Bletchingley), in 1491 MP for Bletchingley (UK Parliament constituency)
Bill Fisher (1926–2010), Australian judge and President of the New South Wales Industrial Commission
Bill Fisher (Oregon politician) (1936–2020), former Oregon State Senator
William Fisher (Nova Scotia politician) (1716–1777), farmer and politician in Nova Scotia
William Fisher (mayor), mayor of Philadelphia, served 1773–1774
William Fisher (Royal Navy officer) (1780–1852), British naval officer
William Fisher (Canadian politician) (1811–1891), merchant and political figure in British Columbia, Canada
William August Fisher (1903–1971), Soviet intelligence officer
William Blake Fisher (1853–1926), British admiral
William Hayes Fisher, 1st Baron Downham (1853–1920), British politician
William S. Fisher (Texas), Republic of Texas soldier, leader of the ill-fated 1842 Mier expedition
William Wordsworth Fisher (1875–1937), British admiral

Other

Bill Fisher, English vocalist, lead singer of Church of the Cosmic Skull
William Fisher, the Kirk Elder of Mauchline, who inspired Burns' poem Holy Willie's Prayer
William Fisher (painter) (1890–1985), American painter
William Fisher (boxer) (1940–2018), Scottish boxer
William Fisher (media executive) (born 1960), media and television executive
William Arms Fisher (1861–1948), American music historian
William Bayne Fisher (1916–1984), British geographer
William Ellsworth Fisher (1871–1937), American architect
William Frederick Fisher (born 1946), American astronaut and emergency physician
William S. Fisher (born 1958), director of Gap, Inc.
William W. Fisher (born 1953), American legal academic
William Webster Fisher (1798–1874), Downing Professor of Medicine at Cambridge University
Willie Fisher (footballer) (1873–1910), Scottish footballer