Chris MacNeil
Father Merrin
Lt. Kinderman
Sharon
Burke Dennings
Father Karras
Regan
Father Dyer (as Reverend William O'Malley S.J.)
Dr. Klein
Dr. Barringer - Clinic Director (as Pete Masterson)
Karl
Willi
Dr. Taney
Psychiatrist
Tom - President of University (as Reverend Thomas Bermingham S.J.)
Karras' Mother
Karras' Uncle
Language Lab Director
Bishop Michael
Chuck - Assistant Director / Demonic Voice
Mary Jo Perrin
Jesuit Dean
Senator at Party
Demon (voice)
Radiologist's Assistant (uncredited)
Nurse (uncredited)
The Producer (uncredited)
First Mental Patient (uncredited)
Astronaut (uncredited)
Doctor (voice) (uncredited)
Violent psychotic patient (uncredited)
Demon's Face (uncredited)
Senator's Wife (uncredited)
Minor Role (uncredited)
Bellevue Nurse (uncredited)
Angiography Doctor (uncredited)
Spiderwalk (uncredited)
2nd Psych Ward Patient (uncredited)
Priest (uncredited)
Subway Vagrant (uncredited)
Priest Singing Around Piano at Party (uncredited)