•
Theodor Herzl (1921) – Prinz Eugen •
Girls to Marry (1932) •
Füsilier Wipf (1938) – Kriegsgefangener (uncredited) •
Enemy Agents Meet Ellery Queen (UK title:
The Lido Mystery) (1942) – Reece •
The Secret Code (1942) – Nazi Prof. Metzger • ''
The Falcon's Brother'' (1942) – Stranger in Telephone Booth (uncredited) •
Lady from Chungking (1942) – Hans Gruber •
Reunion in France (1942) – Desk Clerk in Hotel (uncredited) •
Margin for Error (1943) – Hitler's Voice •
The Moon Is Down (1943) – Hitler's Voice •
Hangmen Also Die! (1943) – Schirmer (as Louis Donath) •
Tonight We Raid Calais (1943) – German Sentry •
Above Suspicion (1943) – Gestapo Officer in Schultz's Laboratory (uncredited) •
This Land Is Mine (1943) – German Captain (uncredited) •
Hostages (1943) – Karel Klima •
The Strange Death of Adolf Hitler (1943) –
Adolf Hitler / Franz Huber •
Gangway for Tomorrow (1943) – Polish Worker (uncredited) •
Tampico (1944) – Commander (uncredited) •
The Hitler Gang (1944) – Gustav von Kahr •
The Story of Dr. Wassell (1944) – Dutch Doctor on Train (uncredited) •
The Seventh Cross (1944) – Wilhelm Reinhardt (uncredited) •
The Master Race (1944) – Schmidt •
Counter-Attack (1945) – Prof. Müller •
Prison Ship (1945) – Professor •
Gilda (1946) – German Cartel Member • ''
The Devil's Mask'' (1946) – Dr. Karger •
Renegades (1946) – Jackorski •
The Jolson Story (1946) – Cantor Yoelson •
Blondie Knows Best (1946) – Dr. Titus •
The Return of Monte Cristo (1946) – Judge Lafitte •
Cigarette Girl (1947) – Otto •
To the Ends of the Earth (1948) – Nicholas Sokim •
Sealed Verdict (1948) – Jakob Meyersohn • ''
The Fighting O'Flynn'' (1949) – Hendrigg •
The Lovable Cheat (1949) – Violette •
The Great Sinner (1949) – Doctor •
Jolson Sings Again (1949) – Cantor Yoelson • ''
There's a Girl in My Heart'' (1949) – Professor Joseph Kroner •
The Killer That Stalked New York (1950) – Dr. Cooper •
Mystery Submarine (1950) – Dr. Adolph Guernitz •
The Great Caruso (1951) – Alfredo Brazzi •
Sirocco (1951) – Flophouse Proprietor •
Journey Into Light (1951) – 'Doc' Thorssen •
My Pal Gus (1952) – Karl •
Sins of Jezebel (1953) – Naboth •
The Veils of Bagdad (1953) – Kaffar •
Torn Curtain (1966) – Professor Gustav Lindt •
The Spy in the Green Hat (1967) – Dr. Heinrich von Kronen •
Too Many Thieves (1967) – Bulanerti ==Television appearances==