William Allen

William Allen may refer to:

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

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