John Allen may refer to:
Academia John Allen (historian) (1771–1843), Scottish historian and political writer John Allen (bookseller) (1789–1829), English bookseller and antiquary John S. Allen (1907–1982), American university president
Business and industry John Allen (miner) (1775–?), English lead miner aboard HMS Investigator John Allen (trade unionist) (1804–1888), Irish trade union leader John Allen (saloon keeper) (1823–1870), American saloon keeper and underworld figure in New York City
Military John Allen (soldier) (1771–1813), American Army officer killed in the War of 1812 John Melville Allen (–1847), American soldier; philhellene; first mayor of Galveston, Texas John Allen (Irish nationalist) (c. 1780–1855), Irish nationalist and colonel in the French army John Allen (RAF officer) (1916–1940), British flying ace of the Second World War John R. Allen Jr. (born 1935), United States Air Force general John R. Allen (born 1953), United States Marine Corps general John J. Allen (general), United States Air Force general
Politics and law New Zealand John Southgate Allen (1883–1955), member of the New Zealand Legislative Council John Manchester Allen (1901–1941), New Zealand politician John Allen (diplomat) (fl. 2009–2011), Administrator of Tokelau
United Kingdom John Allen, 1st Viscount Allen (1660–1726), Irish peer and politician John Allen, 3rd Viscount Allen (1713–1745), Irish peer and politician John Allen, 4th Viscount Allen (died 1753), Irish peer and politician John Hensleigh Allen (1769–1843), English politician; Member of Parliament for Pembroke Sir John Sandeman Allen (Liverpool West Derby MP) (1865–1935), British politician; Member of Parliament for Liverpool West Derby John Sandeman Allen (Birkenhead West MP) (1892–1949), British politician; Member of Parliament for Birkenhead West
United States John Allen (Connecticut politician) (1763–1812), U.S. Representative from Connecticut John J. Allen (judge) (1797–1871), American jurist and U.S. Representative from Virginia John W. Allen (1802–1887), American politician; mayor of Cleveland, Ohio John Kirby Allen (1810–1838), American politician in the Texas House of Representatives; founder of Houston John J. Allen (New York politician) (1842–1926), American politician in the New York State Assembly John Howard Allen (1845–1942), American politician; mayor of Orlando, Florida John B. Allen (1845–1903), American politician; first U.S. Senator from Washington John Mills Allen (1846–1917), U.S. Representative from Mississippi John Clayton Allen (1860–1939), U.S. Representative from Illinois John E. Allen (judge) (1873–1945), justice of the New Hampshire Supreme Court John J. Allen Jr. (1899–1995), U.S. Representative from California John Allen (Arizona politician), American politician and member of the Arizona House of Representatives John Allen (New Jersey politician), member of the New Jersey General Assembly
Other countries John Campbell Allen (1817–1898), Canadian justice of the colonial New Brunswick Supreme Court John J. Allen (Canadian politician) (1871–1935), Canadian politician; mayor of Ottawa William John Allen, Canadian politician
Religion John Allin (Puritan minister) (1596–1671), or Allen, English born Puritan cleric in Massachusetts John Allen (minister) (1741/2–1780s), English Baptist minister who supported the independence of America John Allen (religious writer) (1771–1839), English dissenting layman and religious writer John Allen (archdeacon of Chester) (died 1695) John Allen (archdeacon of Salop) (1810–1886), Welsh cleric John Allen (provost of Wakefield) (1932–2015), English Anglican Provost of Wakefield Cathedral John L. Allen Jr. (1965–2026), American religion journalist
Science and medicine John Allen (engineer) (1928–2026), English engineer and plasma physicist John Allen (physician) (c. 1660–1741), English physician and inventor John F. Allen (biochemist) (born 1950), British biochemist John F. Allen (physicist) (Jack Allen, 1908–2001), Canadian physicist who worked on superfluid helium John P. Allen (born 1929), American ecologist and engineer; co-founder of the Biosphere 2 Center John R. L. Allen (1932–2020), British geologist John Romilly Allen (1847–1907), British archaeologist John T. Allen, Australian atmospheric scientist
Sports John Allen (baseball) (1890–1967), American baseball player Hap Allen (John Francis Allen Jr., 1900–1988), American baseball player John Allen (athlete) (1926–2006), American Olympic athlete John Allen (rugby union) (1942–2022), English rugby union player John Allen (footballer, born 1955), English footballer John Allen (hurler) (born 1955), English hurling player and manager John Allen (footballer, born 1964), English footballer for Chester City and Mansfield Town John Allen (American football) (fl. 1970s), American football coach John Allen (sportsman, born 1974), Australian rugby union player and cricketer John Allen (basketball) (born 1982), American basketball player John Allen (American football coach, SAGU) (born c. 1962), American football coach (SAGU 1996–1997)
Others John Allen (settler) (1806–1879), English settler in the colony of Van Diemen's Land (later Tasmania) John Allen (pioneer) (1796–1851), American pioneer and co-founder of Ann Arbor, Michigan John Allen, Welsh paedophile at the centre of the North Wales child abuse scandal John C. Allen (1907–1979), American roller coaster designer John Whitby Allen (1913–1973), American pioneering model railroader John Allen (murderer) (1934–2015), English criminal who murdered his wife and children John P. Allen (musician), Canadian country, rock and bluegrass fiddler John Allen (guitarist), member of the Nashville Teens
See also Allen (surname) Jack Allen (disambiguation) John Allan (disambiguation) Johnny Allen (disambiguation) Jon Allen (disambiguation) John Alen (1476–1534), English priest and canon lawyer John Alleyn (disambiguation), including John Alleyne John Allin (1921–1998), American Episcopalian bishop