Know For Sure
- Jaar: 1941
- Land: United States of America
- Genre: Drama
- Studio: Research Council of Academy of Motion Picture Arts and Sciences, United States Public Health Service
- Sleutelwoord: syphilis
- Direkteur: Lewis Milestone
- Gooi: Ward Bond, Joseph Crehan, Samuel S. Hinds, Tim Holt, Edwin Maxwell, Etta McDaniel