John Thomas may refer to:

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• John Thomas (American general) (1724–1776), American general in the American Revolutionary War
• John Thomas (colonel) (1720–1811), American colonel in the American Revolutionary War
• John Thomas (VC) (1886–1954), English soldier and recipient of the Victoria Cross
• John Wallace Thomas (1888–1965), Newfoundland and Canadian merchant mariner who served in First and Second World Wars
• John Wellesley Thomas (1822–1908), British military officer

• Jack Thomas (bishop) (John James Absalom Thomas; 1908–1995), Bishop of Swansea and Brecon
• John Thomas (Christadelphian) (1805–1871), British Christian theologian, and founder of the Christadelphians
• John Thomas (bishop of Rochester) (1712–1793), previously Dean of Westminster
• John Thomas (bishop of Salisbury) (1691–1766), previously Bishop of St Asaph and Bishop of Lincoln
• John Thomas (bishop of Winchester) (1696–1781), previously Bishop of Salisbury
• John Thomas (priest, born 1736) (1736–1769), Welsh Anglican priest and antiquarian
• John Thomas (priest, born 1891) (1891–1959), Welsh Anglican priest
• John Christopher Thomas (born c. 1955), American Pentecostal theologian
• John H. Thomas (born c. 1950), American clergyman, General Minister and President of the United Church of Christ, 1999–2009
• John Lloyd Thomas (1908–1984), Anglican clergyman

• John Thomas (American football) (born 1935), American football player for the San Francisco 49ers
• John Thomas (athlete) (1941–2013), American high jumper
• John Thomas (Australian cricketer) (1852–1915), cricketer for Tasmania
• John Thomas (Australian footballer) (1935–2011), Australian rules footballer for Geelong
• John Thomas (baseball), American baseball player
• John Thomas (basketball) (born 1975), American basketball player
• John Thomas (English cricketer) (1879–1949), cricketer for Somerset
• John Thomas (figure skater) (born 1960), Canadian ice dancer
• John Thomas (footballer, born 1958), English footballer for Preston North End and Bolton Wanderers
• John Thomas (ice hockey) (1936–1995), Australian ice hockey player
• John Thomas (Irish footballer), Irish international footballer
• John Thomas (lacrosse) (born 1952), American lacrosse player
• John Thomas (Welsh footballer) (died 1920), Welsh footballer for Sheffield United and Gainsborough Trinity in the 1890s
• John Webster Thomas (1900–1977), American college football player for the Chicago Maroons
• Ron Thomas (bowls) (John Ronald Thomas), Welsh international lawn and indoor bowler

• John Thomas (harpist) (1826–1913), Welsh composer and musician
• "Big" John Thomas (1952–2016), British lead guitarist with Budgie
• John Charles Thomas (1891–1960), American baritone opera singer
• John Rogers Thomas (1830–1896), American composer
• John Weston Thomas (1921–1992), Welsh harpmaker

• John Thomas (sculptor) (1813–1862), British sculptor who worked on British palaces
• John Evan Thomas (1810–1873), Welsh sculptor
• John Paul Thomas (1927–2001), American artist, principally in Hawaii

• John Thomas (cinematographer), winner of the 1995 Independent Spirit Award for Best Cinematography
• John Thomas (screenwriter) (fl. late 20th century), co-screenwriter for the movie Predator
• John G. Thomas (born 1948), American filmmaker

• John Hunter Thomas (1928–1999), American botanist
• John L. Thomas (c. 1927–2005), American historian
• John Martin Thomas (1869–1952), Twelfth president of Rutgers University
• John Peyre Thomas Sr. (1833–1912), South Carolina educator, politician and historian
• John R. Thomas (professor), American intellectual property professor

• John Thomas (fur trader) (c. 1751–1822), Canadian fur trader
• John Thomas Idlet (1931–2002), American Beat poet
• John Thomas (photographer) (1838–1905), Welsh photographer
• John B. Thomas (1925–2018), American electrical engineer, educator and professor
• John E. Thomas (1926–1996), Canadian philosopher
• John Floyd Thomas Jr. (born 1936), Californian murderer
• John Henry Thomas (1854–1928), Australian composer, editor, and conductor
• John Henry Thomas (shipping) (1869–1931), American shipping business and port director
• John Henry Malamah Thomas, Sierra Leonean entrepreneur and mayor of Freetown, Sierra Leone
• John Hudson Thomas (1878–1945), American architect
• John Jacob Thomas (1841–1889), Trinidadian linguist and writer
• John Meurig Thomas (1932–2020), British chemist and materials scientist
• John Rochester Thomas (1848–1901), American architect

• UK slang for penis
  • John Thomas sign

• All pages with titles beginning with John Thomas
• All pages with titles containing John Thomas
• Johnny Thomas (disambiguation)

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