His Greatest Bluff (German: Sein größter Bluff) is a 1927 German silent comedy film directed by Henrik Galeen and Harry Piel and starring Piel, Toni Tetzlaff and Lotte Lorring. Its title is sometimes translated as His Biggest Bluff. Today, the film is best known for the early role it offered to Marlene Dietrich who was only cast after great effort by her agents. The film was shot at the Grunewald Studios, located in Western Berlin, during January and February 1927. It premiered on 12 May 1927 at the in Berlin.