John Douglas may refer to:

• John Douglas, Lord of Balvenie (c. 1433–1463), Scottish soldier
• John Douglas, 2nd Earl of Morton (died 1513), Scottish nobleman
• John Douglas Sr. (1636–?), politician in Maryland
• John Douglas of Broughton (c. 1698–1732), Member of Parliament for Peebleshire 1722–32
• Sir John Douglas, 3rd Baronet, of Kelhead (c. 1708–1778), Member of Parliament for Dumfriesshire, 1741–47
• John Erskine Douglas (c. 1758–1847), Royal Navy admiral
• John Douglas (Royal Marines officer) (died 1814), British officer involved in a scandal regarding an allegedly illegitimate child born to the Princess of Wales, Caroline of Brunswick
• John Douglas (died 1838) (1774–1838), Tory politician, Member of Parliament for Orford 1818–21 and for Minehead 1822–26
• John Douglas, 7th Marquess of Queensberry (1779–1856), Scottish Whig politician
• John Douglas (British Army officer) (1817–1888), British general
• John Douglas (Connecticut politician), member of the General Court of the Colony of Connecticut in 1669–70
• John Douglas (Queensland politician) (1828–1904), Premier of Queensland
• John Douglas (colonial administrator) (1835–1885), Irish governor of Ceylon
• John Douglas, 9th Marquess of Queensberry (1844–1900), Scottish nobleman
• John Carey Douglas (1874–1926), politician in Nova Scotia, Canada
• John Henry Douglas (1851–1930), politician in Ontario, Canada
• John Taylor Douglas (1892–1976), politician in Saskatchewan, Canada
• John Douglas (Irish politician) (1912–1982), senator 1954–57
• John Douglas, 21st Earl of Morton (1927–2016), Scottish peer and landowner
• John St Leger Douglas, British member of parliament for Weobley

• John Douglas (archbishop of St Andrews) (1494–1574), Scottish archbishop and Chancellor of the University of St. Andrews
• John Douglas (bishop of Salisbury) (1721–1807), Scottish bishop and literary critic
• John Waldo Douglas (1818–1883), American minister
• John Albert Douglas (1868–1956), Church of England priest

• Johnny Douglas (1882–1930), English cricket captain and 1908 Olympic middleweight boxing champion
• John Douglas (baseball) (1917–1984), American baseball player
• John Douglas (boxer) (born 1971), Guyanese boxer
• John Douglas (rugby union) (1934–2025), Scottish international rugby player
• John Douglas (fencer) (born 1943), Australian Olympic fencer
• John Douglas (defensive back) (1945–2005), American football player
• John Douglas (linebacker) (born 1945), American football player
• John Douglas (sportsman) (born 1951), Australian rules footballer and cricketer
• John Douglas (basketball) (born 1956), American basketball player
• John Douglas (footballer) (born 1961), English footballer
• Jon Douglas (1936–2010), American tennis and American football player

• John Douglas (lithotomist) (died 1743), Scottish surgeon
• John Douglas (Scottish architect) (c. 1709–1778)
• John William Douglas (1814–1905), English entomologist
• John Douglas (English architect) (1830–1911), British architect
• Johnny Douglas (conductor) (1920–2003), English composer, musical director and string arranger
• John W. Douglas (1921–2010), American attorney and civil rights advocate
• John E. Douglas (born 1945), FBI criminal profiler
• John Douglas (conductor) (1956–2010), American conductor
• John Primrose Douglas, honorary surgeon to the Queen

• Jack Douglas (disambiguation)
• John Douglass (disambiguation)
• Jonathan Douglas (disambiguation)
• All pages with titles beginning with John Douglas