Warn is a surname. Notable people with this surname include:
Bob Warn (born 1945), American baseball coach and player Chris Warn (born 1979), English cricketer Emily Warn, American poet Holly Warn (born 2009), Australian Paralympic swimmer Jayden Warn (born 1994), Australian wheelchair rugby player Jesse Warn, American TV/film director and screenwriter Jim Warn (born 1983), American racing driver Julie Warn (born 1953), Australian performing arts administrator Patti Warn (born 1944), Australian trade unionist Sarah Warn, American writer
See also Warn (disambiguation) Warne (disambiguation)