Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Actor | Citizen Kane | 1941 | Jedediah Leland |
| Actor | Soylent Green | 1973 | William R. Simonson |
| Actor | The Third Man | 1949 | Holly Martins |
| Actor | Touch of Evil | 1958 | Coroner |
| Actor | Gaslight | 1944 | Brian Cameron |
| Actor | Niagara | 1953 | George Loomis |
| Actor | Shadow of a Doubt | 1943 | Uncle Charlie Oakley |
| Actor | Tora! Tora! Tora! | 1970 | Henry L. Stimson, U.S. Secretary of War |
| Actor | The Magnificent Ambersons | 1942 | Eugene Morgan |
| Actor | Heaven's Gate | 1980 | The Reverend Doctor |
| Actor | Airport '77 | 1977 | Nicholas St. Downs III |
| Actor | F for Fake | 1973 | Himself |
| Actor | Hush... Hush, Sweet Charlotte | 1964 | Dr. Drew Bayliss |
| Actor | The Abominable Dr. Phibes | 1971 | Dr. Vesalius |
| Actor | Under Capricorn | 1949 | Sam Flusky |
| Actor | The Scopone Game | 1972 | George |
| Actor | Duel in the Sun | 1946 | Jesse McCanles |
| Actor | Baron Blood | 1972 | Baron Otto von Kleist / Alfred Becker |
| Actor | Portrait of Jennie | 1948 | Eben Adams |
| Actor | Syndicate Sadists | 1975 | Paternò |
| Actor | The Last Sunset | 1961 | John Breckenridge |
| Actor | The Farmer's Daughter | 1947 | Glenn Morley |
| Actor | Island of the Fishmen | 1979 | Prof. Ernest Marvin |
| Actor | Since You Went Away | 1944 | Lieutenant Tony Willett |
| Actor | I'll Be Seeing You | 1944 | Zachary Morgan |
| Actor | Journey Into Fear | 1943 | |
| Writer | Journey Into Fear | 1943 | |
| Actor | Lady Frankenstein | 1971 | Baron Frankenstein |