Know For Sure poster
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Know For Sure

4.2194123mMovieDrama

A 1941 film encouraging people to seek treatment if they had, or might have had, syphilis.

DirectorLewis Milestone
ProducerDarryl F. Zanuck

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Know For Sure was released on October 17, 1941 but we couldn't find it on any streaming service yet. Rights can change — try again later.

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Cast · Directed by Lewis Milestone

WBWard Bond
Ward Bond
patient
JCJoseph Crehan
Joseph Crehan
supporting role
SHSamuel S. Hinds
Samuel S. Hinds
Dr. Perkins
THTim Holt
Tim Holt
Jerry Anderson
EMEdwin Maxwell
Edwin Maxwell
Dr. Paxton
EMEtta McDaniel
Etta McDaniel
supporting role
JNJ. Carrol Naish
J. Carrol Naish
Tony Madroni
FPFrancis Pierlot
Francis Pierlot
Mr. Spencer
SSShepperd Strudwick
Shepperd Strudwick
Dr. Morton

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Know For Sure — streaming FAQ

Which OTT platform streams Know For Sure?

Know For Sure isn't streaming anywhere in United States yet.

Is Know For Sure on Netflix?

No, Know For Sure is not on Netflix in United States as of August 2026.

Is Know For Sure on Amazon Prime Video?

No, Know For Sure isn't on Amazon Prime Video in United States right now.

Where can I watch Know For Sure for free?

Know For Sure isn't streaming in United States yet, so there's no way to watch it free at the moment.

What is the OTT release date for Know For Sure?

Know For Sure hasn't started streaming in United States yet. Based on the typical 6–8 week theatrical-to-streaming window, we estimate it will arrive around December 5, 1941. This is a prediction, not a confirmed date.