- The Emperor's Waltz (1933), as Viktor Eggersdorf
- Liebelei (1933), as Oberleutnant Theo Kaiser
- Little Girl, Great Fortune (1933), as Georg Hellwig
- Inge and the Millions (1933), as Walter Brink
- Blossom Time (1934), as Count Rudi von Hohenberg
- Evensong (1934), as Archduke Theodore
- Die Liebe siegt (1934), as Willy Schneider
- Invitation to the Waltz (1935), as Carl
- Blood Brothers (1935), as Mirko
- Die Pompadour (1935), as François Boucher
- The Postman from Longjumeau (1936), as Chapelou
- The Empress's Favourite (1936), as Fähnrich Alexander Tomsky
- Fräulein Veronika (1936), as Paul Schmidt
- Der Weg des Herzens (1936), as Fred
- Burgtheater (1936), as Josef Rainer
- Romance (1936), as Graf Eduard Romanel
- The Dawn Patrol (1938), as Hauptmann Von Mueller
- Thunder Afloat (1939), as U-boat Captain
- Little Men (1940), as Professor Bhaer
- Sergeant York (1941), as German Major
- Sundown (1941), as Jan Kuypens
- Pacific Rendezvous (1942), as Andre Leemuth
- Panama Hattie (1942), as Lucas Kefler (uncredited)
- The Navy Comes Through (1942), as Richerd Kroner
- Seven Sweethearts (1942), as Carl Randall
- Margin for Error (1943), as Baron Max von Alvenstor
- First Comes Courage (1943), as Maj. Paul Dichter
- Address Unknown (1944), as Baron von Freische
- The Story of Dr. Wassell (1944), as Lt. Dirk van Daal
- Resisting Enemy Interrogation (1944), as Major von Behn (uncredited)
- The Master Race (1944), as Dr. Andrei Krystoff
- Ministry of Fear (1944), as Willi Hilfe
- Experiment Perilous (1944), as Maitland
- Without Love (1945), as Paul Carrell
- Her Highness and the Bellboy (1945), as Baron Zoltan Faludi
- This Love of Ours (1945), as Uncle Bob
- The Catman of Paris (1946), as Charles Regnier
- Lover Come Back (1946), as Paul Millard
- Smash-Up, the Story of a Woman (1947), as Dr. Lorenz
- Slave Girl (1947), as El Hamid
- Walk a Crooked Mile (1948), as Dr. Ritter von Stolb
- The Desert Hawk (1950), as Kibar
- Mystery Submarine (1950), as Lt. Heldman
- Racket Squad (1951)
- Stars Over Hollywood (1951)
- The World in His Arms (1952), as Prince Semyon
- Gruen Guild Playhouse (1952), as Baron de Sarnac, Chief of Police
- Biff Baker, U.S.A. (1952), as Major Morovik
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- Schlitz Playhouse of Stars (1952), as Count Borselli
- Ford Theatre (1953), as Maurice de Szekely
- Love's Awakening (1953), as Michael Rainer
- Regina Amstetten (1954), as Prof. Werner Grüter
- Lola Montès (1955), as Doctor
- Crossroads (1956), as Major Zuntz
- Lux Video Theatre (1955–56), as Pierre / Victor Laszlo
- Jane Wyman Presents: The Fireside Theatre (1956)
- Cheyenne (1956), as Col. Picard
- Passport to Danger (1955–56), as Fabian
- The Joseph Cotten Show (1956) (1955–56), as Vail
- Soldiers of Fortune (1955–56), as Nicholas Van Loon / Helmut Van Dorn
- Climax! (1957), as Paul Ehrenhardt
- Meet McGraw (1957), as Baron Von Schekt
- From the Earth to the Moon (1958), as Jules Verne
- Behind Closed Doors (1959), as Dr. Haas
- General Electric Theater (1959), as Nikolas Bethlan
- Thunder in the Sun (1959), as Andre Dauphin
- 77 Sunset Strip (1959), as Kurt von Paulus
- Five Fingers (1959), as Marcuse
- Behind Closed Doors (1959), as Dr. Haas[1]
- Alcoa Presents: One Step Beyond (1960), as Emile
- The Deputy (1960), as Duke Dmitri
- Maverick (1961), as Comte deLisle
- Hawaiian Eye (1961), as Von Steuben
- Brushfire (1962), as Martin
- Hitler (1962), as Field Marshal Wilhelm Keitel
- Kiss of Evil (1963), as Anton (US TV version)
- The Travels of Jaimie McPheeters (1964), as Baron Pyrrhos
- Morituri (1965), as Busch
- Run For Your Life (1965), as Otto Hiltz
- Convoy (1965), as Field Marshal Von Spear
- Agent for H.A.R.M. (1966), as Professor Jan Stefánik
- The Man From U.N.C.L.E. (1966), as Baron Freddy de Chasseur
- Garrison's Gorillas (1967), as German General
- Insight (1967)
- The Big Valley (1967), as Marquis de Laccaise
- To Rome With Love (1970), as Kurt
- O'Hara, U.S. Treasury (1972), as August Werner
- McMillan & Wife (1972), as Zeiss
- The Hardy Boys/Nancy Drew Mysteries (1977), as Kolbe
- My Wicked, Wicked Ways: The Legend of Errol Flynn (1985), as General Von Helmuth (Last appearance)
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