The Unknown Quantity
- Ane: 1919
- Peyi: United States of America
- Stil: Drama
- Studio: Vitagraph Company of America
- Mo kle: lost film
- Direktè: Thomas R. Mills
- Distribisyon: Corinne Griffith, Huntley Gordon, Harry Davenport, Jack McLean, Jack Ridgeway, F.R. Buckley
