La Vache et le Prisonnier is a French-Italian tragicomedy film from 1959, starring Fernandel and directed by Henri Verneuil, that is based on Jacques Antoine's 1945 novel, Une histoire vraie. It tells the story of a French prisoner of war in World War II forced to work on a farm in Germany who decides to escape by walking away with a cow he calls Marguerite.
The most successful film in France in 1959, with over 8 million seats sold, it was also the most successful film of Fernandel's career.