The Long Arm
- Cast: Jack Hawkins, John Stratton, Dorothy Alison, Michael Brooke, Sam Kydd
- Duration: 96 minutes
- Genre: Mystery, Crime, Thriller
- Rating: 6.974/10
- Release Date: 1956-06-01
Scotland Yard detectives attempt to solve a spate of safe robberies across England beginning with clues found at the latest burglary in London. The film is notable for using a police procedural style made popular by Ealing in their 1950 film The Blue Lamp. It is known in the US as The Third Key.
