- John Brown[?] (1722 - 1787) was a Scottish clergyman and Biblical commentator.
- John Brown[?] (1735 - 1788) was a Scottish physician who developed his own medical "system".
- John Brown[?], (1757-1837), was a Representative and Senator to the US Congress.
- John Brown (died 1845) was an eloquent British evangelical preacher and Vicar of St. Mary's Leicester.
- John Brown[?] (1810 - 1882) was a Scottish physician and essayist.
- John Brown[?] (1816 - 1896) was the inventor of a process for rolling armour-plate, and founded the Atlas steelworks, Sheffield.
- John Brown[?] is an American boxer who has tried, unsuccessfully, several times to become a world champion.
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