- John Campbell, 1st Baron Campbell; Scottish lawyer, biographer and politician (1779–1861)
- John Campbell, Scottish army officer; ruler of Orissa, India (1802–1878)
- John Archibald Campbell, Associate Justice of the Supreme Court of the United States (1811–1889)
- John Francis Campbell, Scottish author and scholar who specialised in Celtic studies (1821–1885)
- John Gregorson Campbell, Scottish folklorist and Free Church minister (1836–1891)
- John Logan Campbell, Prominent New Zealand public figure (1817–1912)
- John M. Campbell, American lawyer (1851–20th century)
- John Wood Campbell, American science fiction writer and editor (1910–1971)
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