The Unknown Quantity
- साल: 1919
- देश: United States of America
- शैली: Drama
- स्टूडियो: Vitagraph Company of America
- कीवर्ड: lost film
- निदेशक: Thomas R. Mills
- कास्ट: Corinne Griffith, Huntley Gordon, Harry Davenport, Jack McLean, Jack Ridgeway, F.R. Buckley
