Willy Semmelrogge (1923-1984) was a German actor, renowned for his film career as a character actor.

His most iconic portrayal is that of the Second Watch Officer (II.WO) in Wolfgang Petersen's masterpiece, *Das Boot* (1981), which brought him international recognition.

With his lanky figure, weathered face, and husky voice, Semmelrogge was a master at bringing complex and often ambiguous characters to life. He specialized in playing memorable supporting characters, often imbued with an aura of cynicism, authority, or subtle unease. His intense on-screen presence made him perfect for portraying morally ambiguous characters or those with a dark side, leaving a distinctive mark on German cinema.