Cast
- Peter Arens as Marquis von Posa
- Fritz Rasp as Großinquisitor
- Paul Verhoeven as Philipp II., König von Spanien
- Georg Thomas as Don Carlos, der Kronprinz
- Elfriede Kuzmany as Elisabeth von Valois
- Rosel Schäfer as Prinzessin von Eboli
- Hans Elwenspoek as Graf von Lerman
- Franziska Stömmer as Gräfin Fuentes
- Werner Hessenland as Beichtvater Domingo
- Ernst Fritz Fürbringer as Herzog von Alba