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