John Seddon is a British psychologist.
John Seddon may also refer to:
- John Seddon (politician) (1934–2021), New Zealand politician and chief executive
- John Pollard Seddon (1827–1906), British architect
- John Seddon (Unitarian) (1719–1769), English Unitarian minister
- John Seddon of Warrington (1725–1770), English dissenting minister, rector of Warrington Academy
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