Who Is Number One?
- Ár: 1917
- Land: United States of America
- Genre: Mystery
- Stúdíó: Paramount Pictures
- Lykilorð: movie serial
- Leikstjóri: William Bertram
- Leikarar: Kathleen Clifford, Cullen Landis, Gordon Sackville, Neil Hardin, Bruce Smith, Ethel Ritchie
