Marguerite & Julien (French: Marguerite et Julien) is a 2015 French drama film directed by Valérie Donzelli about a brother and sister involved in an incestuous relationship. The film is based on a 1970s screenplay written by Jean Gruault for François Truffaut, which in turn is based on the true story of aristocratic siblings Marguerite and Julien de Ravalet who were executed in the 17th century on charges of incest and adultery. It was selected to compete for the Palme d'Or at the 2015 Cannes Film Festival.