Spencer Tracy as George Heisler

Signe Hasso as Toni

Hume Cronyn as Paul Roeder

Jessica Tandy as Liesel Roeder

Agnes Moorehead as Madame Marelli

Herbert Rudley as Franz Marnet

Felix Bressart as Poldi Schlamm

Ray Collins as Wallau

Alexander Granach as Zillich

Katherine Locke as Frau Hedy Sauer

George Macready as Bruno Sauer

Paul Guilfoyle as Fiedler

Steven Geray as Dr. Loewenstein

Kurt Katch as Leo Hermann

Kaaren Verne as Leni (as Karen Verne)

Konstantin Shayne as Fuellgrabe

George Suzanne as Bellani

John Wengraf as Overkamp

George Zucco as Fahrenburg

Steven Muller as Hellwig

Eily Malyon as Fraulein Bachmann

Hugh Beaumont as Truck Driver (uncredited)

Charles Arnt as Herr Binder (uncredited)

Robert Blake as Small Boy (uncredited)

Paul E. Burns as Pelzer (uncredited)

William Challee as Fischer (uncredited)

Russell Custer as Prisoner at Concentration Camp (uncredited)

William Edmunds as Aldinger (uncredited)

Frank Hagney as Man on Street (uncredited)

Jimmy Hawkins as Paul and Liesel Roeder's Son (uncredited)

Leon Tyler as Fritz / Hitler Youth (uncredited)