Demy is a surname. Notable persons with that name include:
- Jacques Demy (1931–1990), French film director
- Marie Demy (born 1994), Belgian badminton player
- Mathieu Demy (born 1972), French actor, film director and producer
- Valentine Demy (born 1963), Italian actress
See also
edit- Michèle Demys (born 1943), French athlete
- Demi and Demy, short given names