Anthony Quinn

Kiril Lakota

Laurence Olivier

Piotr Ilyich Kamenev

Oskar Werner

Fr. David Telemond

David Janssen

George Faber

Vittorio De Sica

Cardinal Rinaldi

Leo McKern

Cardinal Leone

John Gielgud

The Elder pope

Barbara Jefford

Dr. Ruth Faber

Rosemary Dexter

Chiara

Frank Finlay

Igor Bounin

Burt Kwouk

Chairman Peng

Arnoldo Foà

Gelasio (as Arnoldo Foa')

Paul Rogers

Augustinian

George Pravda

Gorshenin (credit only)

Clive Revill

Tovarich Vucovich

Niall MacGinnis

Capuchin Monk

Marne Maitland

Cardinal Rahamani

Isa Miranda

The Marchesa

Gerald Harper

Brian

Leopoldo Trieste

Dying Man's Friend

Peter Copley

English Cardinal

Arthur Howard

English Cardinal

Jean Rougeul

Dominican

Arnaldo Caivano

Dying Man (uncredited)

Inna Alexeievna

Party Guest (uncredited)

Silvana Bacci

Party Guest (uncredited)

John Frederick

American Cardinal (uncredited)

Åke Lindman

Soldier Releasing Lakota (uncredited)

Lex Monson

Third African Priest (uncredited)

Dom Moor

Polish Cardinal (uncredited)

Antonio Proietti

Cardinal (uncredited)

Alfred Thomas

African Cardinal (uncredited)