The Mystery of Mr. X
- Godina: 1934
- Zemlja: United States of America
- Žanr: Comedy, Crime, Mystery
- Studio: Metro-Goldwyn-Mayer
- Ključna riječ: diamond, jewel thief, pre-code
- Direktor: Edgar Selwyn
- Uloge: Robert Montgomery, Elizabeth Allan, Lewis Stone, Ralph Forbes, Henry Stephenson, Forrester Harvey