John Barker
John Barker may refer to:
- John Barker (scholar) (fl. c. 1471–1482), Old Etonian logician
- John Barker (16th century MP) for Ipswich (UK Parliament constituency)
- Sir John Barker, 4th Baronet (1655–1696), English MP for Ipswich
- John Barker (Philadelphia) (c. 1746–1818), Mayor of Philadelphia, Pennsylvania from 1807–1810 and 1812–1813
- John Barker (medical writer), 1708-1748), medical writer
- John Barker (diplomat) (1771–1849), English diplomat and horticulturist
- Sir John Barker, 1st Baronet (1840–1914), founder of Barkers department store in Kensington, London, and Liberal MP
- John Barker (English footballer) (1948–2004), English football (soccer) player
- John Barker (Scottish footballer) (born 1869), Scottish football (soccer) player
- John Barker (RAF officer) (1910–2004), RAF officer and commander of the Royal Ceylon Air Force
- John Barker (Australian politician) (born 1947), Australian politician
- John Barker (Australian rules footballer) (born 1975), Australian rules footballer with Hawthorn, Brisbane Lions and Fitzroy
- Johnny Barker (entertainer) (born 1979), New Zealand actor, director and musician
- John Barker (advertising executive) (born 1965), founder of Barker/DZP, the ACME Brand Content Company and Digital Zen Productions
- John Barker (divine) (1682–1762), Presbyterian divine
- John Barker (Parliamentarian), English draper and politician who sat in the House of Commons between 1640 and 1653