William Allen may refer to:
- William (Orgain) Allen (1829-1875), Civil War-era Virginia landowner and financier
- William Allen (artist) (1957-)
- William Allen (biographer) (1784–1868), evangelical Congregationalist
- William Allen (Canadian politician) (1919–1985), former Toronto politician
- William Allen (congressman) (1827–1881), United States Congressman from Ohio
- William Allen (cricketer) (1893-1950), English cricketer
- William Allen (governor) (1803–1879), American politician, Democratic representative and senator from the U.S. state of Ohio
- William Allen (loyalist) (1704–1780), wealthy merchant, landowner, jurist and politician in colonial Pennsylvania. Founder of Allentown, Pennsylvania
- William Allen (philanthropist) (circa 1790–1856), joint founder of St Peter's College, Adelaide, South Australia
- William Allen (Quaker) (1770–1843), English Quaker, scientist and philanthropist
- William Allen (Royal Navy officer) (1792–1864), English naval officer and explorer
- William Allen (soldier) (1845-1882), American soldier and Medal of Honor recipient
- William Allen (unionist politician) (1866-1947), Northern Irish unionist politician
- William Barnsley Allen (1892–1933), English recipient of Victoria Cross
- William Cardinal Allen (1532–1594), English Catholic priest and cardinal
- William E. Allen, American acting director of the U.S. Federal Bureau of Investigation
- William Edward David Allen (1901-1973), Ireland-born English scholar, Foreign Service officer, politician and businessman
- William F. Allen (1883–1946), American businessman and politician
- William F. Allen (New York) (1808-1878), Judge of the NY Court of Appeals, and NYS Comptroller
- William Francis Allen (1830–1889), American classical scholar
- William Henry Allen (1784-1813), naval officer
- William Henry Allen (university president) (1808-1882), American professor and academic administrator
- William Howard Allen (1790-1822), United States naval officer
- William McPherson Allen (1900-1985), U.S. aircraft businessman
- William Rodney Allen, American author and professor of English
- William Sheridan Allen, American author and historian
- William V. Allen (1847-1924), American jurist and U.S. senator from Nebraska
- William Wilson Allen (circa 1844-1890), English recipient of the Victoria Cross
See also
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