William Allen may refer to:
Politicians
United States
- William Allen (congressman) (1827–1881), United States Representative from Ohio
- William Allen (governor) (1803–1879), U.S. Representative, Senator, and 31st Governor of Ohio
- William Allen (loyalist) (1704–1780), wealthy merchant, chief justice of Pennsylvania's provincial Supreme Court, and founder of Allentown, Pennsylvania
- William Allen (Montana politician) (1871–1953), member of the Montana House of Representatives and lieutenant governor
- William C. Allen (politician) (1814–1887), American businessman and politician in Wisconsin
- William F. Allen (Delaware politician) (1883–1946), American businessman and politician
- William F. Allen (New York politician) (1808–1878), American judge and politician
- William Fessenden Allen (1831–1906), American businessman and royal advisor in the Kingdom of Hawaii
- William H. Allen (politician) (c. 1851–?), member of the Mississippi House of Representatives in the 1880s
- William J. Allen (1829–1901), congressman from Illinois and federal judge
- William P. Allen (politician) (1818–1901), member of the Wisconsin State Assembly
- William Reynolds Allen (1860–1921), justice of the North Carolina Supreme Court
- William S. Allen (1857–1926), Iowa Secretary of State, 1913–1918
- William V. Allen (1847–1924), U.S. Senator from Nebraska
- William W. Allen (politician) (1908–1992), member of the Pennsylvania House of Representatives
- William Allen (Massachusetts judge) (died 1891), Justice of the Massachusetts Supreme Judicial Court
Other
- William Allen (National Liberal politician) (1870–1945), British politician
- William Allen (Armagh MP) (1866–1947), Northern Irish unionist politician
- William Allen (Canadian politician) (1919–1985), from Toronto
- William Bell Allen (1812–1869), Australian politician from New South Wales
- William C. Allen (1937–2021), Bahamanian politician and banker
- William Edward David Allen (1901–1973), British politician and historian
- William Johnston Allen (1835–1915), Australian politician from New South Wales
- William Shepherd Allen (1831–1915), English Liberal politician
- William Torrance Allen, Canadian politician from Ontario
Artists, architects, writers, and scholars
- William Allen (actor) (died 1647), English actor in the Caroline era
- William Allen (biographer) (1784–1868), American evangelical Congregationalist
- William Allen (Utah architect) (1849–1928), American architect in Utah
- William H. Allen (architect) (1858–1936), architect of New Haven, Connecticut
- William Henry Allen (artist) (1894–1988), British artist and printmaker active in New Zealand from 1925 to the 1940s
- William Allen (fl. mid 20th century), American architect in California; co-designer of Burbank City Hall
- William B. Allen (born 1944), American political scientist
- William Francis Allen (1830–1889), American classical scholar
- William Henry Allen (academician) (1808–1882), American professor
- W. H. Allen (artist) (William Herbert Allen, 1863–1943), English landscape watercolour artist
- William Rodney Allen, American author and professor of English
- William Sheridan Allen (1932–2013), American author and historian
- W. Sidney Allen (1918–2004), English linguist and philologist
- William T. Allen (1944–2019), professor of corporate law at New York University law school
Military personnel
- William Allen (Royal Navy officer) (1792–1864), English naval officer and explorer
- William Allen (soldier) (1845–1882), American recipient of Medal of Honor
- William Allen (VC 1879) (1843–1890), English recipient of the Victoria Cross
- William Barnsley Allen (1892–1933), English recipient of the Victoria Cross
- William Henry Allen (1784–1813), American naval officer
- William Howard Allen (1790–1822), American naval officer
- William W. Allen (general) (1835–1894), Confederate general
Scientists
- William Allan (geneticist) (1881–1943), American physician and geneticist
- William Allen (English Quaker) (1770–1843), English Quaker, scientist and philanthropist
- William Douglas Allen (1914–2008), British/Australian physicist and electrical engineer
- William Henry Allen (engineer), (1844–1926), British engineer
Sports people
- William Allen (sailor) (born 1947), American sailor and Olympic champion
- William Reginald Allen (English cricketer) (1893–1950), English cricketer
- William L. Allen (c. 1877–1907), American football player and coach
- William D. Allen (1886–1979), American football and basketball coach
Clergy and philanthropists
- William Allen (cardinal) (1532–1594), English Roman Catholic cardinal priest
- William Allen (English Quaker) (1770–1843), English Quaker, scientist and philanthropist
- William Allen (Quaker minister) (1821–1898), American Quaker minister, also active in Canada
- William Allen (philanthropist) (1790–1856), public benefactor in South Australia
- William Allen (Congregationalist) (1847–1919), clergyman, composer and poet in Victoria, Australia
Others
- William Allen (banker) (1736–1792), English banker
- William E. Allen (1880–1960), director of the U.S. Bureau of Investigation
- William G. Allen (1820–1888), American professor and abolitionist
- William McPherson Allen (1900–1985), American aircraft businessman and President of Boeing
- William (Orgain) Allen (1829–1875), American landowner and financier from Virginia
- William P. Allen (trade unionist) (1888–1958), British trade unionist
- William R. Allen (economist) (1924–2021), American economist, professor and author
See also
- Bill Allen (disambiguation)
- Will Allen (disambiguation)
- Willie Allen (disambiguation)
- W H Allen (disambiguation)
- William Allen High School, Allentown, Pennsylvania
- William Allan (disambiguation)
- William Van Alen (1883–1954), American architect
Topics referred to by the same termThis disambiguation page lists articles about people with the same name. If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: