The Mystery of Mr. X
- Leto: 1934
- Država: United States of America
- Žanr: Комеdija, Кriminalni, Misterija
- Studio: Metro-Goldwyn-Mayer
- Ključna beseda: diamond, jewel thief, pre-code
- Direktor: Edgar Selwyn
- Igralska zasedba: Robert Montgomery, Elizabeth Allan, Lewis Stone, Ralph Forbes, Henry Stephenson, Forrester Harvey