Others
- John Seymour (technician), Grammy Award winning sound technician
- John Seymour (author) (1914–2004), author and influential figure in the self-sufficiency movement
- John Seymour, 4th Duke of Somerset (before 1646–1675)
- John Seymour, 19th Duke of Somerset (born 1952)
- John Laurence Seymour (1893–1986), American composer
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