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