The Great Radium Mystery
- An: 1919
- Pays: United States of America
- Genre: Aventure, Action
- Studio: Universal Film Manufacturing Company
- Mot-clé: government agent, movie serial
- Réalisateur: Robert F. Hill, Robert Broadwell
- Jeter: Cleo Madison, Bob Reeves, Eileen Sedgwick, Bob Kortman, Ed Brady