The Mystery of Willoughby Castle
- Blwyddyn: 1979
- Gwlad: United States of America
- Genre: Family, Mystery
- Stiwdio: Quadrus Production, Quadrus Communications
- Allweddair:
- Cyfarwyddwr: Luisa Morell
- Cast: Kevin Rodell, Luisa Morell, William Lowry, Ned York, Martha Webster
