Walwyn is a surname. Notable people with the surname include:
- Charles Walwyn (1883–1959), British Army officer
- John Walwyn (by 1520–1566 or later), English politician
- Keith Walwyn (1956–2003), Kittian footballer
- Myron Walwyn (born 1972), English politician
- Steve Walwyn (born 1956), Musician
- Thomas Walwyn (disambiguation), multiple people