Walwyn is a surname. Notable people with the surname include:
Charles Walwyn (1883–1959), British Army officer Clifford Walwyn, West Indian cricketer Fulke Walwyn, British jockey and racehorse trainer Fulke Walwyn Kim Muir Challenge Cup Humphrey Walwyn, Royal Navy officer, Governor of Newfoundland James Humphrey Walwyn, Royal Navy officer John Walwyn (by 1520–1566 or later), English politician Karen Walwyn, American pianist and composer Keith Walwyn (1956–2003), Kittian footballer Matt Walwyn, footballer Myron Walwyn (born 1972), British Virgin Islander politician Nile Walwyn, footballer Peter Walwyn, British racehorse trainer Steve Walwyn (born 1956), English musician Thomas Walwyn, two 14th century Members of Parliament for Herefordshire constituency William Walwyn, English pamphleteer, a Leveller and a medical practitioner
See also Walwyn Brewley, British Virgin Islander politician Walwyn's Castle, Pembrokeshire, Wales