William Allen
William Allen is the name of the following people:
- William Allen (Cardinal) (1532–1594), English cardinal and politician
- William Allen (Loyalist) (1704–1780), American businessman, founder of the city of Allentown, Pennsylvania
- William Allen (Quaker) (1770–1843), English scientist and philanthropist
- William Allen (Politician, 1803) (1803–1879), American politician, Member of Congress for Ohio
- William Allen (Politician, 1827) (1827–1881), American politician, Member of Congress for Ohio
- William Allen (sailor) (born 1947), American sailor
- William E. Allen , American government official
- William F. Allen (1883–1946), American politician
- William Fitch Allen (1808–1878), American lawyer and politician (Democratic Party)
- William J. Allen (1829–1901), American politician
- William McPherson Allen (1900–1985), American businessman
- William R. Allen (1871–1953), American politician
- William S. Allen (1857-1926), American politician (Republican Party)
- William Sheridan Allen (1932–2013), American historian
- William Sidney Allen (1918-2004), British Indo-Europeanist
- William V. Allen (1847–1924), American politician
- William Wirt Allen (1835-1894), American brigadier general
See also:
- William Allan (1782–1850), Scottish draftsman and painter
- Bill Allen