Filmography
| Year | Title | Role |
| 1973 | The Iceman Cometh | Harry Hope |
| 1970 | ...tick...tick...tick... | Mayor Jeff Parks |
| 1967 | Hombre | Dr. Alex Favor |
| 1964 | Seven Days in May | President Jordan Lyman |
| 1960 | Inherit the Wind | Matthew Harrison Brady |
| 1959 | Middle of the Night | Jerry Kingsley |
| 1957 | Albert Schweitzer | Albert Schweitzer |
| 1956 | Alexander The Great (1956) | Philip of Macedonia |
| 1956 | The Man in the Gray Flannel Suit | Ralph Hopkins |
| 1955 | The Desperate Hours | Dan C. Hilliard |
| 1954 | Executive Suite | Loren Phineas Shaw |
| 1954 | The Bridges at Toko-Ri | Rear Adm. George Tarrant |
| 1953 | Man on a Tightrope | Karel Cernik |
| 1951 | Death of a Salesman | Willy Loman |
| 1950 | The Titan: The Story of Michelangelo | Narrator |
| 1946 | The Best Years of Our Lives | Al Stephenson |
| 1945 | Tomorrow the World | Mike Frame |
| 1944 | ADVENTURES OF MARK TWAIN+FESTIVAL OF CLAYMATION | Samuel Langhorne Clemens |
| 1942 | I Married a Witch | Jonathan Wooley/Nathaniel Wooley/Samuel Wooley/Wallace Wooley |
| 1941 | So Ends Our Night | Josef Steiner |
| 1940 | Susan and God | Barrie Trexel |
| 1939 | The 400 Million | Narrator |
| 1938 | Trade Winds | Sam Wye |
| 1937 | Nothing Sacred | Wally Cook |
| 1937 | A Star Is Born (1937) | Norman Maine |
| 1936 | Anthony Adverse | Anthony Adverse |
| 1936 | Mary of Scotland | Bothwell |
| 1936 | The Road to Glory | Lieutenant Michel Denet |
| 1935 | Les Miserables (1935) | Jean Valjean/Champmathieu |
| 1935 | Anna Karenina (1935) | Vronsky |
| 1934 | The Affairs of Cellini | Benvenuto Cellini |
| 1934 | Death Takes a Holiday | Death |
| 1934 | The Barretts of Wimpole Street | Robert Browning |
| 1934 | We Live Again | Prince Dmitri Nekhlyudov |
| 1933 | Design for Living | Thomas B. "Tom" Chambers |
| 1933 | Tonight Is Ours | Sabien Pastal |
| 1932 | Merrily We Go to Hell | Jerry Corbett |
| 1932 | The Sign of the Cross | Marcus Superbus |
| 1932 | Smilin' Through | Kenneth Wayne/Jeremy Wayne |
| 1931 | Honor Among Lovers | Jerry Stafford |
| 1931 | Dr. Jekyll and Mr. Hyde (1931) | Dr. Henry Jekyll/Mr. Hyde |
| 1930 | Sarah and Son | Howard Vanning |
| 1930 | Laughter | Paul Lockridge |
| 1930 | The Royal Family of Broadway | Tony Cavendish |
| 1929 | The Wild Party | James Gilmore |
