Klaus Kinski as Fitzcarraldo

Claudia Cardinale as Molly

José Lewgoy as Don Aquilino

Miguel Ángel Fuentes as Cholo

Paul Hittscher as Orinoco Paul

Huerequeque Enrique Bohórquez as Huerequeque

Grande Otelo as Station Master

Peter Berling as Opera Manager

David Pérez Espinosa as Campa Chief

Milton Nascimento as Opera House Blackman

Ruy Polanah as Rubber Baron

Salvador Godínez as Old Missionary

Dieter Milz as Young Missionary

William L. Rose as Notary

Leoncio Bueno as

Veriano Luchetti as Opera 'Ernani' - Ernani (voice)

Costante Moret as Opera 'Ernani' - Ernani

Dimiter Petkov as Opera 'Ernani' - Silva

Mietta Sighele as Opera 'Ernani' - Elvira (voice)

Lourdes Magalhães as Opera 'Ernani' - Orchestra Pit Singer

Jean-Claude Dreyfus as Opera 'Ernani' - Sarah Bernhardt

Isabel Jiménez de Cisneros as Opera 'I puritani' - Doña Elvira

Liborio Simonella as Opera 'I puritani' - Arturo

Jesus Goiri as Opera 'I puritani' - Giorgio

Christian Mantilla as Opera 'I puritani' - Walton