Entertainment
* John F. Warren (1909–2000), American cinematographer * John Warren (actor) (1916–1977), British screenwriter and actor * John Warren (musician) (born 1938), Canadian baritone saxophonist and composerMedicine
* John Warren (surgeon, born 1753) (1753–1815), American surgeon during the Revolutionary War, founder of Harvard Medical School * John Collins Warren (surgeon, born 1778) (1778–1856), American surgeon, founder of the ''New England Journal of Medicine'', son of the above * John Collins Warren (surgeon, born 1842) (1842–1927), American surgeon, son of Jonathan Mason Warren * John Warren (anatomist, born 1874) (1874–1928), American professor of anatomy at Harvard University, son of the above * Robin Warren (John Robin Warren, 1937–2024), Australian pathologistMilitary
* SirPolitics
* John Warren (Dover MP) (died 1547), English member of Parliament for Dover * John Warren (Upper Canada politician) (died 1832), merchant and politician in Upper Canada * John Henry Warren (c. 1812–1885), English-born merchant and politician in Newfoundland * John Holden Warren (1825–1901), Wisconsin state senator * John Warren (Australian politician) (1830–1914), Australian pastoralist and politician * John E. Warren,Religion
* John Warren (bishop) (1730–1800), Archdeacon of Worcester, Bishop of Saint David's, Wales, Bishop of Bangor, Wales * John Warren (priest) (1767–1838), Dean of BangorScience and engineering
* John Warren (mathematician) (1796–1852), English mathematician andSports
* John Warren (South African cricketer) (1873–1900), South African cricketer * John A. Warren (1904–1981), American football and basketball coach at the University of Oregon * John Warren (Indian cricketer) (fl. 1935–1936), Indian cricketer who played for Bengal * John Warren (basketball, born 1947) (born 1947), American basketball player * Johnny Warren (1943–2004), Australian soccer player and coach * John Warren (punter) (born 1960), American football player * John Warren (born 1960), racing manager of Queen Elizabeth's horsesOthers
* John Warren (convict) (c. 1826–1898), British convict transported to Western Australia * John Warren, 3rd Baron de Tabley (1835–1895), English poet, numismatist, botanist and authority on bookplates * John Warren (journalist) (born 1937), Canadian journalist who anchored the CBC Parliamentary Television NetworkSee also
* Jonathan Mason Warren (1811–1867), American surgeon, pioneer of plastic and reconstructive surgery, son of John Collins Warren {{hndis, Warren, John