Demus is a surname. Notable people with the surname include:
Chaka Demus (born 1963), Jamaican reggae musician and DJ Jörg Demus (1928–2019), Austrian classical pianist Lashinda Demus (born 1983), American hurdler Otto Demus (1902–1990), Austrian art historian Roberto Demus (born 1979), Argentinean footballer
See also Scratchy Demus