- Angela Winkler – Katharina Blum
- Mario Adorf – Kommissar Beizmenne (Inspector Beizmenne)
- Dieter Laser – Werner Tötges
- Jürgen Prochnow – Ludwig Götten
- Heinz Bennent – Dr. Hubert Blorna
- Hannelore Hoger – Trude Blorna
- Rolf Becker – Prosecutor Hach
- Harald Kuhlmann – Moeding
- Herbert Fux – Weninger
- Regine Lutz – Else Woltersheim
- Werner Eichhorn – Konrad Beiters
- Karl Heinz Vosgerau – Alois Sträubleder
- Angelika Hillbrecht – Frau Pletzer
- Horatius Häberle – Prosecutor Dr. Korten
- Henry van Lyck – 'Scheich' Karl
- Stephanie Thönnessen – Claudia Sterm
- Peter Franke – Dr. Heinen
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