Kiril Lakota
Anthony Quinn
Piotr Ilyich Kamenev
Laurence Olivier
Chairman Peng
Burt Kwouk
Gelasio (as Arnoldo Foa')
Arnoldo Foà
Augustinian
Paul Rogers
Gorshenin (credit only)
George Pravda
Tovarich Vucovich
Clive Revill
Capuchin Monk
Niall MacGinnis
Cardinal Rahamani
Marne Maitland
The Marchesa
Isa Miranda
Brian
Gerald Harper
Dying Man's Friend
Leopoldo Trieste
Fr. David Telemond
Oskar Werner
English Cardinal
Peter Copley
Arthur Howard
Dominican
Jean Rougeul
Dying Man (uncredited)
Arnaldo Caivano
Party Guest (uncredited)
Inna Alexeievna
Silvana Bacci
American Cardinal (uncredited)
John Frederick
Soldier Releasing Lakota (uncredited)
Åke Lindman
Third African Priest (uncredited)
Lex Monson
Polish Cardinal (uncredited)
Dom Moor
George Faber
David Janssen
Cardinal (uncredited)
Antonio Proietti
African Cardinal (uncredited)
Alfred Thomas
Cardinal Rinaldi
Vittorio De Sica
Cardinal Leone
Leo McKern
The Elder pope
John Gielgud
Dr. Ruth Faber
Barbara Jefford
Chiara
Rosemary Dexter
Igor Bounin
Frank Finlay
Director of Photography
Erwin Hillier
Director
Michael Anderson
Producer
George Englund
Screenplay
John Patrick
James Kennaway
Set Decoration
Hugh Hunt
Sound Recordist
Franklin Milton
Key Makeup Artist
Giancarlo Del Brocco
Dorcy Howard
Assistant Director
Tony Brandt
Costume Design
Orietta Nasalli Rocca
Camera Operator
Ernest Day
Sound Mixer
Kurt Doubrowsky
Makeup Artist
Amato Garbini
Art Direction
George W. Davis
Edward C. Carfagno
Editor
Ernest Walter
Original Music Composer
Alex North
Novel
Morris L. West