Robert Shaw
— Martin Luther
Robert Morley
— Papst Leo
Ronald Fraser
— Tetzel
Max Adrian
— Cajetan
Kenneth J. Warren
— Hans
Bernard Kay
— Weinand
Frank Middlemass
— Staupitz
William Marlowe
— The Knight
Reginald Barratt
— Lucas
Yootha Joyce
— Katharine Luther
John Byron
— Eck
Alexander Davion
— Miltitz
André van Gyseghem
— The Prior