Klaus Kinski
Don Lope de Aguirre
Helena Rojo
Inés de Atienza
Del Negro
Brother Gaspar de Carvajal
Ruy Guerra
Don Pedro de Ursúa
Peter Berling
Don Fernando de Guzmán
Cecilia Rivera
Flores, Aguirre's Daughter
Daniel Ades
Perucho
Edward Roland
Okello
Armando Polanah
Armando
Alejandro Repullés
Gonzalo Pizarro
Claus Biederstaedt
Brother Gaspar de Carvajal (voice) (uncredited)
Lothar Blumhagen
Don Pedro de Ursúa (voice) (uncredited)
Heinz Theo Branding
Don Fernando de Guzmán (voice) (uncredited)
Christian Brückner
Balthasar (voice) (uncredited)
Michael Chevalier
Conqueror Being Beheaded (voice) (uncredited)
Norbert Gescher
Conqueror (voice) (uncredited)
Justo González
González (uncredited)
Uta Hallant
Inés / Flores (voice) (uncredited)
Manfred Lehmann
Conqueror (voice) (uncredited)
Antonio Marquez
(uncredited)
Gerd Martienzen
Don Lope de Aguirre (voice) (uncredited)
Edgar Ott
Gonzalo Pizarro (voice) (uncredited)
Uwe Paulsen
Okello (voice) (uncredited)
Dieter Ranspach
Perucho (voice) (uncredited)