Stacy Keach
Martin Luther
Hugh Griffith
Tetzel
Judi Dench
Katharina
Peter Cellier
Prior
Leonard Rossiter
Brother Weinand
Patrick Magee
Luther's Father
Thomas Heathcote
Friend
Julian Glover
Knight
Matthew Guinness
Reading Knight
Peter Kenvyn
Praying Monk (uncredited)
Tom Baker
Pope Leo X
Malcolm Stoddard
Emperor Charles the Fifth
Bruce Carstairs
Duke Frederick Elector of Saxony
Robert Stephens
Johann von Eck
Alan Badel
Cardinal Cajetan de Vio
Maurice Denham
Johann von Staupitz Vicar General