Les Diaboliques is a 1955 French psychological horror thriller film co-written and directed by Henri-Georges Clouzot, starring Simone Signoret, Véra Clouzot, Paul Meurisse and Charles Vanel. It is based on the 1952 novel She Who Was No More by Pierre Boileau and Thomas Narcejac.

Henri-Georges Clouzot was a French film director, screenwriter and producer. He is best remembered for his work in the thriller film genre, having directed The Wages of Fear (1953) and Les Diaboliques (1955), which are critically recognized as among the greatest films of the 1950s. He also directed documentary films, including The Mystery of Picasso (1956), which was declared a national treasure by the government of France.