Fred Zinnemann Director Spencer Tracy George Heisler Actor Signe Hasso Antonia aka Toni Actor Hume Cronyn Paul Roeder Actor Jessica Tandy Liesel Roeder Actor Agnes Moorehead Mme. Marelli Actor Herbert Rudley Franz Marnet Actor Felix Bressart Poldi Schlamm Actor Ray Collins Ernst Wallau Actor Alexander Granach Zillich Actor Katherine Locke Frau Hedy Sauer Actor George Macready Bruno Sauer Actor Paul Guilfoyle Fiedler Actor Steven Geray Dr. Löwenstein Actor Kurt Katch Leo Hermann Actor Karen Verne Leni Actor Konstantin Shayne Fuellgrabe Actor John Wengraf Kommisar Overkamp Actor George Zucco Fahrenburg Actor Steven Muller Hellwig Anders Actor Eily Malyon Fraulein Johanna Bachmann Actor Helen Deutsch Screenwriter Pandro S. Berman Producer Karl Freund Cinematographer Thomas Richards Film Editing Roy Webb Original Music Cedric Gibbons Art Director Leonid Vasian Art Director Edwin B. Willis Set Decoration