Friedrich Rudolf Klein-Rogge (24 November 1885 – 29 May 1955) was a German film actor. Klein-Rogge is known for playing sinister figures in films in the 1920s and 1930s as well as being a mainstay in director Fritz Lang's Weimar-era films. He is probably best known in popular culture, particularly to English-speaking audiences, for playing the archetypal mad scientist role of C. A. Rotwang in Lang's Metropolis and as the criminal genius Doctor Mabuse.

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Rudolf Klein-Rogge was a prominent German film actor of the Weimar era, celebrated for portraying sinister figures and master villains in classic silent cinema.
He is best known for his iconic performances as the mad scientist C. A. Rotwang in Fritz Lang's Metropolis and as the criminal genius Doctor Mabuse.
He was a primary collaborator and mainstay in the silent-era masterpieces directed by Fritz Lang.