| Spencer Tracy | Henry Drummond |
| Fredric March | Matthew Harrison Brady |
| Gene Kelly | E. K. Hornbeck |
| Florence Eldridge | Mrs. Sarah Brady |
| Dick York | Bertram T. Cates |
| Harry Morgan | Judge Mel |
| Donna Anderson | Rachel Brown |
| Elliott Reid | Prosecutor Tom Davenport |
| Claude Akins | Rev. Jeremiah Brown |
| Noah Beery Jr. | John Stebbins |
| Norman Fell | WGN Chicago Radio Broadcaster |
A fundamentalist orator opposes a liberal lawyer defending a Darwinist teacher in the 1920s South.
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