Ruy Blas is a 1948 French-Italian historical drama film directed by Pierre Billon and starring Danielle Darrieux, Jean Marais and Marcel Herrand. The screenplay was written by Jean Cocteau based on the 1838 play of the same title by Victor Hugo. It was shot at the Icet Studios in Milan and on location at Cassis in Southern France. The film's sets were designed by the art director Georges Wakhévitch.