Surnames
- Alfred Richard Cecil Selwyn (1824–1902), British geologist who surveyed parts of Australia and Canada
- The Selwyns, Archie and Edgar Selwyn, American theatrical producers
- Charles Jasper Selwyn (1813–1869), Judge, Lord Justice, M.P. & privy counsellor
- Charles William Selwyn (1858–1893), British army officer and Conservative politician
- Don Selwyn (c.1936-2007), Maori actor and film director from New Zealand
- Edgar Selwyn (1875–1944), American film director and theatrical producer
- George Augustus Selwyn (1809–1878), Bishop of New Zealand
- George Augustus Selwyn (politician) (1719–1791), English politician and wit
- Sir Percy Selwyn Selwyn-Clarke (1893–1976), Director of Medical Services, Hong Kong, 1937–1943, and Governor of the Seychelles, 1947–1951
- John Richardson Selwyn (1844–1898), Second bishop of Melanesia
- Sydney Selwyn (1934–1996), British physician, medical scientist and notable expert in the history of medicine.
- Tim Selwyn (born 1974), New Zealand political activist who was tried for sedition
- Victor Selwyn (1917–2005), British journalist
- William Marshall Selwyn, (1879–1951), Bishop of Fulham, Archdeacon of Bath
- Zachariah Selwyn (born 1975), American TV personality
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