Others
- John Barker (scholar) (fl. c. 1471–1482), Old Etonian logician
- John Barker (medical writer), 1708-1748), medical writer
- Sir John Barker, 1st Baronet (1840–1914), founder of Barkers department store in Kensington, London, and Liberal MP
- John Barker (RAF officer) (1910–2004), RAF officer and commander of the Royal Ceylon Air Force
- 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
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