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- John Campbell, 1st Earl Of Loudoun (died 1633)
- John Campbell, 2nd Duke Of Argyll (1680–1743)
- John Campbell Of Cawdor (1695–1777), minor British politician
- John Campbell, 4th Earl Of Loudoun (1705–1782)
- John Campbell, 5th Duke Of Argyll (1723–1806)
- John Campbell, 1st Baron Campbell (1779–1861), Lord Chancellor of England
- John Campbell, 9th Duke Of Argyll (1845–1914)
- John Campbell (Northern Irish Politician) (1862–1929), Member of the Northern Ireland Parliament
- John Campbell (Irish Politician) (born 1870), Member of the United Kingdom Parliament from Ireland
- John Campbell (author) (1708-1775), Scottish author
- John C. Campbell (1867–1919), American educator known for surveying life in the Appalachians
- Sir John Logan Campbell (1817–1912), a prominent figure in the history of Auckland, New Zealand
- John Campbell (Falkirk) , Scottish baron and businessman who settled in Falkirk
- John Campbell (London Clergyman) , mid-19th century minister of Whitefield's Tabernacle, Moorfields, London
- John Edward Campbell (1862–1924), mathematician credited for the Campbell-Hausdorff formula
- John W. Campbell (1910–1971), very influential editor of ''Analog Science Fiction and Fact''
- John Campbell (harness Racing Driver) (born 1955), Canadian harness racing driver
- John P. Campbell , industrial and organizational psychologist at the University of Minnesota
- John Campbell (snooker Player) , Australian snooker player
- John Campbell (horse Trainer) , thoroughbred horse trainer
- John Campbell (philosopher) , philosopher
- John Campbell (broadcaster) (born 1964), television personality in New Zealand
- John Campbell (bassist) , bassist for Lamb of God
- John Campbell (banker) , banker, founder of what became Coutts & Co
- John Campbell (general) , a British major general during the American Revolution on the Gulf Coast front against Spain
- John Campbell (athlete) , New Zealand athlete
- John Campbell (footballer) , footballer who scored for Aston Villa F.C. in the 1897 FA Cup final
- John Campbell (Wrestler) , Professional Wrestler, I.E. Kaos Wrestling Organization
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