The Master Key
- Blwyddyn: 1914
- Gwlad: United States of America
- Genre: Action, Adventure, Drama
- Stiwdio: Universal Film Manufacturing Company
- Allweddair: movie serial
- Cyfarwyddwr: Robert Z. Leonard
- Cast: Robert Z. Leonard, Ella Hall, Harry Carter, Jean Hathaway, Alfred Hickman, Wilbur Higby
