Un flic is a 1972 crime thriller film, the last directed by Jean-Pierre Melville before his death the following year. It stars Alain Delon, Richard Crenna and Catherine Deneuve. Delon had previously portrayed criminals in Melville's Le Samouraï (1967) and Le Cercle Rouge (1970), but in Un flic, his role is reversed, and he plays the title character.

Jean-Pierre Grumbach, known professionally as Jean-Pierre Melville, was a French filmmaker. Considered a spiritual father of the French New Wave, he was one of the first fully-independent French filmmakers to achieve commercial and critical success. His works include the crime dramas Bob le flambeur (1956), Le Doulos (1962), Le Samouraï (1967), and Le Cercle Rouge (1970), and the war films Le Silence de la mer (1949) and Army of Shadows (1969).