Others
- John C. Slater (1900–1976), American physicist and theoretical chemist
- John Slater (figure skater), British figure skater and ice dancer
- John Slater (actor) (1916–1975), British actor specialising in Cockney parts
- John Slater (musician), British heavy metal guitarist, member of the band Rise to Addiction and former member of Blaze Bayley
- John Slater (cricketer) (1795–?), English cricketer
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