The Key to Yesterday
- Blwyddyn: 1914
- Gwlad: United States of America
- Genre: Drama
- Stiwdio: Favorite Players Film Co.
- Allweddair:
- Cyfarwyddwr: John Francis Dillon
- Cast: Carlyle Blackwell, Edna Mayo, Gypsy Abbott, George Brunton, John Francis Dillon, Jack Prescott
