The Mystery of Lake Lethe
- Blwyddyn: 1917
- Gwlad: United States of America
- Genre: Mystery
- Stiwdio: Vitagraph Company of America
- Allweddair:
- Cyfarwyddwr: Rollin S. Sturgeon
- Cast: Webster Campbell, William Duncan, Corinne Griffith, Anne Schaefer, Nell Shipman