Duigan is a surname. Notable people with the surname include:
Harry Duigan (1875–1931), Australian footballer John Robertson Duigan (1882–1951), Australian aviator John Duigan (born 1949), Australian film director John Evelyn Duigan (1883–1950), New Zealand major general Mike Duigan, Australian politician Nick Duigan (born 1984), Australian footballer Nick Duigan (politician), Australian politician Suzanne Duigan (1924–1993), Australian paleobotanist