Lancelot du Lac is a 1974 French fantasy drama film written and directed by Robert Bresson. It retells the story of Lancelot and Guinevere's love as Camelot and the Round Table fall apart. It is based on Arthurian legend and medieval romances, especially the Lancelot-Grail cycle, and the works of Chrétien de Troyes.

In common with Bresson's later films, the cast was composed of amateur actors, several of whom did not appear in any other film. Bresson's direction demanded a purposeful lack of emotion in the acting style, and reduced or eliminated the fantastical elements of the Grail legend. While much of the production is intentionally stylised as Medieval "Romance", the film is punctuated with moments of graphic violence.