William Mann

William Mann may refer to:


 * William Mann (astronomer) (1817–1873), English astronomer active in the Cape Colony
 * William Mann (MP), English politician in the House of Commons, 1621–1625
 * William Mann (settler) (1610–1650), original settler of Providence, Rhode Island
 * William Abram Mann (1854–1934), general officer in the United States Army
 * William d'Alton Mann (1839–1920), American Civil War soldier and newspaper and magazine publisher
 * William C. Mann "Bill" (died 2004), computational linguist
 * William Mann (RAF officer) (1899–1966), senior Royal Air Force officer and flying ace
 * Billy Mann (William H. Mann), record producer/singer/songwriter
 * William Hodges Mann (1843–1927), American politician
 * William Mann (cricketer) (1878–1938), English cricketer
 * William J. Mann, American author and gay historian
 * William Mann (Australian politician) (1875–1951), Australian politician
 * William Julius Mann (1819–1892), American Lutheran theologian and author
 * William M. Mann (1886–1960), entomologist and director of the National Zoo, Washington, D.C., 1925–1956
 * William Mann (mathematician) (1920–2006), American mathematician
 * William Mann (critic) (1924–1989), British music critic for The Times