Filmography
| Year | Title | Role |
| 1966 | The Fortune Cookie | Professor Winterhalter |
| 1964 | Robin and the Seven Hoods (1964) | Hammacher |
| 1964 | 36 Hours | German Guard |
| 1961 | The Errand Boy | Baron Elston Carteblanche |
| 1957 | The Wings of Eagles | Manager |
| 1954 | White Christmas (1954) | Landlord |
| 1954 | Living It Up | Dr. Emile Egelhofer |
| 1954 | HARVEY/THE GLENN MILLER STORY | W. Kranz (pawnshop owner) |
| 1954 | Three Ring Circus | Colonel Fritz Schlitz |
| 1953 | Stalag 17 | Sgt. Johann Sebastian Schulz |
| 1953 | Ma and Pa Kettle on Vacation | Cyrus Kraft |
| 1952 | The World in His Arms | General Ivan Vorashilov |
| 1951 | On the Riviera | Gapeaux |
| 1950 | Border Incident | Hugo Wolfgang Ulrich |
| 1948 | The Emperor Waltz | Dr. Zwieback |
| 1948 | Give My Regards to Broadway | Arthur Dinkel |
| 1946 | The Dolly Sisters | Ignatz Tsimmis |
| 1946 | A Night in Casablanca | Count Pfefferman |
| 1945 | House of Frankenstein | Burgomeister Hussman |
| 1945 | A Royal Scandal | Gen. Ronsky |
| 1944 | Summer Storm | Kuzma |
| 1943 | Sweet Rosie O'Grady | Joe Flugelman |
| 1942 | Desperate Journey | Preuss |
| 1942 | To Be or Not to Be (1942) | Col. Ehrhardt |
| 1941 | Love Crazy | Dr. Wuthering |
| 1941 | World Premiere | Franz von Bushmaster |
| 1941 | That Uncertain Feeling | Kafka |
| 1940 | Dr. Ehrlich's Magic Bullet | Dr. Hans Wolfert |
| 1939 | Ninotchka | Michael Simonavich Iranoff |
| 1939 | Only Angels Have Wings | John 'Dutchy' Van Reiter (as Sig Rumann) |
| 1939 | Never Say Die (1995) | Poppa Ingleborg |
| 1939 | Confessions of a Nazi Spy | Dr. Julius Gustav Krogmann |
| 1939 | Honolulu | Professor Timmer |
| 1938 | The Great Waltz | Wertheimer the Banker |
| 1937 | A Day at the Races | Dr. Leopold X. Steinberg |
| 1937 | Nothing Sacred | Dr. Emil Eggelhoffer |
| 1937 | Think Fast Mr. Moto | Nicolas Marloff |
| 1937 | Maytime | Fanchon |
| 1937 | Midnight Taxi (2024) | John B. Rudd |
| 1935 | A Night at the Opera | Herbert Gottlieb |
| 1934 | Marie Galante | Brogard |
| 1934 | The World Moves On | Baron von Gerhardt |
