Effi Briest is a 1974 West German black-and-white historical drama film directed, written and narrated by Rainer Werner Fassbinder, and produced by Juliane Lorenz. Fassbinder adapted the screenplay from German author Theodor Fontane's 1894 novel of the same name about a young 19th century woman whose affair with a charismatic womanizer has long-term effects on her marriage to an older man. The film uses Fontane's words in dialogue, narration and text of letters.

Rainer Werner Fassbinder, sometimes credited as R. W. Fassbinder, was a German filmmaker, actor, and dramatist. He is widely regarded as one of the major figures and catalysts of the New German Cinema movement. Versatile and prolific, his over 40 films span a variety of genres, most frequently blending elements of Hollywood melodrama with social criticism and avant-garde techniques. His films, according to him, explored "the exploitability of feelings". His work was deeply rooted in post-war German culture: the aftermath of Nazism, the German economic miracle, and the terror of the Red Army Faction. He worked with a company of actors and technicians who frequently appeared in his projects.