The Secret of Blood () is a 1953 Czechoslovak biographical drama film directed by Martin Frič about Czech doctor Jan Janský who discovered and classified the four different blood types. It competed at 14th Venice International Film Festival.
Cast Vladimír Ráž as Dr. Jan Janský Zdeněk Štěpánek as Prof. Kuffner Jiřina Petrovická as Hedva Vlastimil Brodský as Dr. Kozdera Svatopluk Beneš as Dr. Regent Rudolf Hrušínský as Dr. Kurzweil Radovan Lukavský as Worker Kolčava Vlasta Chramostová as Kolčavová Rudolf Deyl as Batman Papík Josef Hlinomaz as Alois František Filipovský as Doctor at Lecture Josef Kemr as Angry patient Gustav Hilmar as Prof. Kyselka
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