The Lost Honour of Katharina Blum, or: How violence develops and where it can lead is a 1975 German political drama film, based on the 1974 novel of the same name by Heinrich Böll, written for the screen and directed by Volker Schlöndorff and Margarethe von Trotta. Schlöndorff and von Trotta wrote the script with an emphasis on the vindictive and harsh treatment of an innocent woman by the public, the police and the media. The film stars Angela Winkler as Blum, Mario Adorf as Kommissar Beizmenne, Dieter Laser as Tötges, and Jürgen Prochnow as Ludwig. The film and the novel were also adapted into an American TV film titled The Lost Honor of Kathryn Beck in 1984.

Volker Schlöndorff is a German film director, screenwriter and producer who has worked in Germany, France and the United States. He was a prominent member of the New German Cinema of the late 1960s and early 1970s.