Know For Sure
- Ano: 1941
- País: United States of America
- Gênero: Drama
- Estúdio: Research Council of Academy of Motion Picture Arts and Sciences, United States Public Health Service
- Palavra-chave: syphilis
- Diretor: Lewis Milestone
- Fundida: Ward Bond, Joseph Crehan, Samuel S. Hinds, Tim Holt, Edwin Maxwell, Etta McDaniel