| Ellen Burstyn | Chris MacNeil |
| Linda Blair | Regan Teresa MacNeil |
| Max von Sydow | Father Lankester Merrin |
| Lee J. Cobb | Lieutenant William Kinderman |
| Kitty Winn | Sharon Spencer |
| Jack MacGowran | Burke Dennings |
| Jason Miller | Father Damien Karras |
| Reverend William O'Malley | Father Dyer |
| Barton Heyman | Dr. Klein |
| Pete Masterson | Dr. Barringer, Clinic Director |
| Rudolf Schundler | Karl |
| Gina Petrushka | Willi |
| Robert Symonds | Dr. Taney |
| Arthur Storch | Psychiatrist |
| Reverend Thomas Bermingham | Tom, President of University |
| Vasiliki Maliaros | Karras' Mother |
| Tito Vandis | Karras' Uncle |
| Wallace Rooney | Bishop Michael |
| Ron Faber | Chuck, Assistant Director/Demonic Voice |
| Donna Mitchell | Mary Jo Perrin |
| Roy Cooper | Jesuit Dean |
| Robert Gerringer | Senator at Party |
| Mercedes McCambridge | Pazuzu |
An actress calls upon Jesuit priests to try to end the demonic possession of her 12-year-old daughter .
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