John Maddox may refer to:
- John Maddox (1925–2009), British scientist
- John Maddox (cricketer) (born 1930), Australian former cricketer
- Johnny Maddox (1927–2018), American ragtime pianist
- John Medex Maddox (1789–1861), British playwright and theatre manager
- John W. Maddox (1848–1922), U.S. Representative from Georgia
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