| Burt Lancaster | Elmer Gantry | |
| Arthur Kennedy | Jim Lefferts | |
| Shirley Jones | Lulu Bains | |
| Edward Andrews | George F. Babbitt | |
| Hugh Marlowe | Rev. Philip Garrison | |
| Philip Ober | Rev. Planck |
| Jean Simmons | Sister Sharon Falconer | |
| Dean Jagger | William L. Morgan | |
| Patti Page | Sister Rachel | |
| John McIntire | Rev. John Pengilly | |
| Joe Maross | Pete | |
| Barry Kelley | Police Capt. Holt |