While the City Sleeps is a 1928 American synchronized sound crime drama film about a tough New York City police detective, played by Lon Chaney, out to catch a murdering gangster. While the film has no audible dialog, it was released with a synchronized musical score with sound effects using the sound-on-film Western Electric Sound System process. The film was directed by Jack Conway, written by Andrew Percival Younger, and co-starred Anita Page, Carroll Nye, Wheeler Oakman, and Mae Busch.

Leonidas Frank "Lon" Chaney was an American actor and makeup artist. He is regarded as one of the most versatile and powerful actors of cinema, renowned for his characterizations of tortured, often grotesque and afflicted, characters and for his groundbreaking artistry with makeup. Chaney was known for his starring roles in such silent horror films as The Hunchback of Notre Dame (1923) and The Phantom of the Opera (1925). His ability to transform himself using makeup techniques that he developed earned him the nickname "The Man of a Thousand Faces".