Martin Semmelrogge (b. 1955) is a prolific German actor with a distinctive film career.

He is internationally known for his role as Second Officer Philipp Thomsen in Wolfgang Petersen's film *U-Boot 96* (original title *Das Boot*, 1981), which established him as a key figure in German cinema. He subsequently appeared in notable international productions such as Steven Spielberg's *Schindler's List* (1993), where he portrayed a sadistic Nazi leader.

His career is studded with complex characters, often possessing an aura of rebellion, transgression, or gruffness. He specialized in portraying "tough guy" roles, military personnel, criminals, or figures on the fringes of society, distinguishing himself with his intense screen presence and unmistakable voice. His incisive acting has made him a recognizable and appreciated face in the cinematic landscape.