Who Is Number One?
- Blwyddyn: 1917
- Gwlad: United States of America
- Genre: Mystery
- Stiwdio: Paramount Pictures
- Allweddair: movie serial
- Cyfarwyddwr: William Bertram
- Cast: Kathleen Clifford, Cullen Landis, Gordon Sackville, Neil Hardin, Bruce Smith, Ethel Ritchie
