1966Spy Smasher Returns— Col. Von Kahr
1963The Prize— Mr. Rolfe Bergh - Chaperon
1963Decision at Midnight— Uncle
1962The Pigeon That Took Rome— Col. Wilhelm Krafft
1961On the Double— Oberkommandant
1959A Private's Affair— Dr. Leyden
1958She Demons— Col. Karl Osler
1958Frankenstein 1970— Wilhelm Gottfried
1954Mukaddes Azap— Dr. Albert Fuss
1954Aslan Yürekli Richard— Austrian Knight (uncredited)
1954Bir Yıldız Doğuyor— Mr. Ettinger (uncredited)
1954Jungle Gents— Dr. Goebbel
1954The Snow Creature— Dr. Louis DuPont
1954Silver Needle in the Sky— Dr. Loran
1953South Sea Woman— Capt. van Dorck
1953Captain Scarface— Dr. Yeager
1953Phantom from Space— Dr. Wyatt
1951Target Unknown— Doctor (uncredited)
1950Kill or Be Killed— Gregory Marek
1949Act of Violence— German (voice) (uncredited)
1946Under Nevada Skies— Alberti
1946Dangerous Millions— Rudolph Busch
1945Counter-Attack— Stillman
1945Escape in the Desert— Hoffman
1943Watch on the Rhine— Oberdorff
1942Olmak ya da Olmamak— Gestapo Sergeant at Desk at Top of Hotel Stairs (uncredited)
1942Sherlock Holmes ve Gizli Silah— Braun (uncredited)
1942The Phantom Plainsmen— Colonel Eric Hartwig (as Robert O. Davis)
1942Spy Smasher— Col. Von Kohr
1942The Secret Code— Rudi Thysson
1942The Pied Piper— Lieutenant
1942Nazi Agent— Cab Driver (uncredited)
1942Junior Army— Horner - Nazi Saboteur (as Robert O. Davis)
1942Riders of the Northland— Agent (as Robert O. Davis)
1942Eagle Squadron— German Squad Leader
1942The Great Impersonation— Karl Hofmann
1942The Devil with Hitler— Nazi Officer at Hitler's filmed Speech (uncredited)
1942Desperate Journey— Kruse
1941Mr. Dynamite— Frederick the Butler
1941King of the Texas Rangers— His Excellency
1941Down in San Diego— Henry Schrode
1941Underground— Official
1941A Dangerous Game— Dr. Fleming
1940Büyük Diktatör— Tomanian Commandant at Osterlich / Robert O. Davis
1940The Mortal Storm— Gestapo Official Hartman
1940Arise, My Love— Prussian Officer (uncredited)
1940Knute Rockne All American— Elder in Norway (uncredited)
1940The Man I Married— Storm Trooper
1940Meet the Wildcat— Feral--Henchman
1939Espionage Agent— Paul Strawn (as Robert O. Davis)
1939Escape to Paradise— Alexander Komac
1939Pack Up Your Troubles— Von Richtman
1939The Mad Empress— Herzfeld
1938That Mothers Might Live— Doctor (uncredited)
1937Champagne Waltz— Emperor Franz Joseph
1936We're in the Legion Now— Sgt. Groeber
1935Rendezvous— Radio Operator (uncredited)
1935Last of the Pagans— Superintendant's Assistant (uncredited)
1935Here's to Romance— Violinist
1934Stamboul Quest— Karl (as Rudolph Amendt)
1934The Fountain— Geof Van Leyden
1934Hell in the Heavens— Lt. Schroeder (as Rudolph Amendt)
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