Blum Affair (German: Affaire Blum) is a 1948 German drama film directed by Erich Engel and starring Hans Christian Blech, Ernst Waldow and Karin Evans.

It is based on a real 1926 case in Magdeburg in which a German Jewish industrialist is tried for murder.

The film's sets were designed by the art director Emil Hasler.

Bosley Crowther, critic for The New York Times, praised it as "a trenchant dramatic exposition of the way in which an innocent German Jew is almost destroyed by nascent Nazis—back in 1926.

"[2] The film sold more than 4,330,000 tickets, making it one of DEFA's all-time most successful productions.