Once a Sinner
- Curs: 1950
- País: United Kingdom
- Gènere: Drama
- Estudi: John Argyle Productions, Butcher's Film Service
- Paraula clau: british noir, embezzlement, bank clerk
- Director: Lewis Gilbert
- Repartiment: Pat Kirkwood, Jack Watling, Joy Shelton, Sydney Tafler, Thora Hird, Humphrey Lestocq