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