- The Last of the Secret Agents?
1966 Prof. Werner von Koenig
- Way... Way Out
1966 Russian Delegate
- The Fortune Cookie
1966 Professor Winterhalter
- 36 Hours
1964 German Guard
- Robin and the 7 Hoods
1964 Hammacher (uncredited)
- One, Two, Three
1961 Count von Droste Schattenburg (voice) (uncredited)
- The Errand Boy
1961 Baron Elston Carteblanche
- Around the World with Nellie Bly
1960 Tug Captain
- The Wings of Eagles
1957 Manager
- Many Rivers to Cross
1955 Spectacle Man
- Carolina Cannonball
1955 Stefan
- Spy Chasers
1955 King Rinko
- 3 Ring Circus
1954 Fritz Schlitz
- The Glenn Miller Story
1954 W. Kranz
- Living It Up
1954 Dr. Emile Egelhofer
- White Christmas
1954 Landlord (uncredited)
- Stalag 17
1953 Johann Schulz
- Houdini
1953 Schultz
- The World in His Arms
1952 General Ivan Vorashilov
- O. Henry's Full House
1952 Menkie (segment "The Gift of the Magi") (uncredited)
- Ma and Pa Kettle on Vacation
1952 Cyrus Kraft
- On the Riviera
1951 Gapeaux
- Father Is a Bachelor
1950 Jericho Schlosser
- Border Incident
1949 Hugo Wolfgang Ulrich
- Give My Regards to Broadway
1948 Arthur Dinkel
- The Emperor Waltz
1948 Dr. Zwieback
- If You Knew Susie
1948 Count Alexis
- Mother Wore Tights
1947 Papa
- A Night in Casablanca
1946 Count Pfefferman / Heinrich Stubel
- Faithful in My Fashion
1946 Professor Boris Riminoffsky
- Night and Day
1946 Wilowski
- She Went to the Races
1945 Dr. Gurke
- The Dolly Sisters
1945 Ignatz Tsimmis
- Men in Her Diary
1945 Mme. Irene
- A Royal Scandal
1945 General Ronsky
- House of Frankenstein
1944 Burgomeister Hussman
- It Happened Tomorrow
1944 Mr. Beckstein
- Summer Storm
1944 Kuzma
- The Hitler Gang
1944 General von Hindenburg
- Government Girl
1943 Ambassador
- Tarzan Triumphs
1943 Sergeant
- They Came to Blow Up America
1943 Dr. Herman Holger
- The Song of Bernadette
1943 Louis Bouriette
- Sweet Rosie O'Grady
1943 Joe Flugelman
- To Be or Not to Be
1942 Col. Ehrhardt
- Crossroads
1942 Dr. Alex Dubroc
- Enemy Agents Meet Ellery Queen
1942 Heinrich, Spy Leader
- China Girl
1942 Jarubi
- Desperate Journey
1942 Preuss
- Berlin Correspondent
1942 Dr. Dietrich
- Remember Pearl Harbor
1942 Dirk Van Hoorten
- Love Crazy
1941 Dr. Wuthering
- That Uncertain Feeling
1941 Kafka (as Sig Rumann)
- The Wagons Roll at Night
1941 Hoffman the Great
- Shining Victory
1941 Professor Herman Von Reiter
- This Woman Is Mine
1941 John Jacob Astor
- So Ends Our Night
1941 Ammers
- The Man Who Lost Himself
1941 Dr. Simms (as Sig Rumann)
- World Premiere
1941 Franz von Bushmaster
- Comrade X
1940 Emil Von Hofer
- Outside the Three-Mile Limit
1940 Van Cleve
- Dr. Ehrlich's Magic Bullet
1940 Dr. Hans Wolfert
- Four Sons
1940 Newmann
- Bitter Sweet
1940 Herr Schlick
- I Was an Adventuress
1940 Herr Protz
- Victory
1940 Mr. Schomberg
- Ninotchka
1939 Comrade Iranoff
- Only Angels Have Wings
1939 Dutchy
- Never Say Die
1939 Poppa Ingleborg
- Remember?
1939 Dr. Schmidt
- Honolulu
1939 Psychiatrist
- Confessions of a Nazi Spy
1939 Krogman
- The Great Waltz
1938 Wertheimer
- The Saint in New York
1938 Hutch Rellin
- Girls on Probation
1938 Roger Heath
- Paradise for Three
1938 Mr. Bold
- Suez
1938 Sergeant Pellerin
- I'll Give a Million
1938 Anatole Primerose
- A Day at the Races
1937 Dr. Leopold X. Steinberg
- Nothing Sacred
1937 Dr. Emil Eggelhoffer
- Thin Ice
1937 Prime Minister
- Think Fast, Mr. Moto
1937 Nicolas Marloff
- Thank You, Mr. Moto
1937 Colonel Tchernov
- Lancer Spy
1937 Lt. Col. Gottfried Hollen
- Midnight Taxi
1937 John B. Rudd
- The Great Hospital Mystery
1937 Dr. Taggert
- On the Avenue
1937 Herr Hanfstangel
- Love Under Fire
1937 General Montero
- This Is My Affair
1937 Gus
- Heidi
1937 Police Captain
- Maytime
1937 Fanchon
- Seventh Heaven
1937 Durand (as Sig Rumann)
- The Princess Comes Across
1936 Steindorf
- The Bold Caballero
1936 Commandante Sebastian Golle
- A Night at the Opera
1935 Gottlieb
- The Farmer Takes a Wife
1935 Blacksmith
- The Wedding Night
1935 Mr. Jan Novak
- Under Pressure
1935 Doctor
- East of Java
1935 Hans Muller
- Spring Tonic
1935 Matt Conklin
- The World Moves On
1934 Baron von Gerhardt (as Siegfried Rumann)
- Marie Galante
1934 Brogard
- Servants' Entrance
1934 Hans Hansen (as Siegfried Rumann)
- Die Königsloge
1929 Bailiff
- Lucky Boy
1929 Bridge player (Unbilled)
