George C. Scott
Lt. William 'Bill' Kinderman
Ed Flanders
Father Joseph Kevin Dyer
Brad Dourif
James Venamun / The Gemini Killer
Jason Miller
Father Damien Karras / Patient X
Nicol Williamson
Father Morning
Scott Wilson
Dr. Temple
Nancy Fish
Nurse Allerton
George DiCenzo
Stedman
Don Gordon
Ryan
Lee Richardson
University President
Grand L. Bush
Sergeant Atkins
Mary Jackson
Mrs. Clelia
Viveca Lindfors
Nurse X
Ken Lerner
Dr. Freedman
Tracy Thorne
Nurse Keating
Barbara Baxley
Shirley
Zohra Lampert
Mary Kinderman
Harry Carey, Jr.
Father Kanavan
Sherrie Wills
Julie Kinderman
Edward Lynch
Patient A
Clifford David
Dr. Bruno
Alex Zuckerman
Korner Boy
Lois Foraker
Nurse Merrin
Tyra Ferrell
Nurse Blaine
James Burgess
Thomas Kintry
Kevin Corrigan
Altar Boy
Peggy Alston
Mrs. Kintry
John Durkin
Elderly Jesuit
Bobby Deren
Nurse Bierce
Jan Neuberger
Alice
Alexis Chieffet
Counter Attendant
Debra Port
Waitress
Walt MacPherson
Police Sergeant
David Dwyer
Second Police Officer
Danny Epper
Police Driver
William Preston
Old Man in Wheelchair
Chuck Kinlaw
Attendant
Demetrios Pappageorge
Casperelii
Nina Hansen
Little Old Lady
Samuel L. Jackson
Dream Blind Man
Shane Wexel
First Dream Boy (uncredited)
Ryan Paul Amick
Second Dream Boy (uncredited)
John Coe
Old Man in Dream (uncredited)
Jodi Long
First Dream Woman (uncredited)
Kathy Gerber
Second Dream Woman (uncredited)
Jan Smook
Radio Man (uncredited)
Amelia Campbell
Young Girl in Dream (uncredited)
Cherie Baron
Nurse
Larry King
Larry King
C. Everett Koop
Everett Koop
Patrick Ewing
Angel of Death
Clinton Brandhagen
Young Boy in Dream (uncredited)
Michael Criscuolo
Mental Patient (uncredited)
Cindy Cullom
Nurse (uncredited)
Colleen Dewhurst
Satan (voice) (uncredited)
Fabio
Angel (uncredited)
Randy Aaron Fink
Student (uncredited)
Jeff Henry
Angel (uncredited)
Patt Noday
Hospital Ward Priest (uncredited) (unconfirmed)
Manley Pope
Angel (uncredited)
John Thompson
John Thompson - Georgetown Hoyas Basketball Coach (uncredited)
Michael Tove
Man in Purgatory (uncredited)
Brad Waller
Asylum Inmate (uncredited)
Gary Wheeler
Crime Photographer (uncredited)
Teresa Wright
Penitent (uncredited)
Charles Edwin Powell
Patient X Possessed
William Peter Blatty
Director
Gerry Fisher
Director of Photography
William Peter Blatty
Screenplay
Peter Lee-Thompson
Editor
Mike Smithson
Prosthetic Supervisor
Donlee Jorgensen
Sound Editor
Richard Van Dyke
Sound Mixer
Hugh Scaife
Set Decoration
Cydney Cornell
Hair Supervisor
Jeff Burks
Animation Supervisor
Abe Milrad
Visual Effects Supervisor
Leslie Dilley
Production Design
Del Acevedo
Makeup Artist
Paul Stanhope Jr.
Makeup Supervisor
Warren Hamilton Jr.
Sound Editor
James Christopher
Sound Editor
Mat Beck
Visual Effects Supervisor
William Purcell
Special Effects Coordinator
Erin Koplow
Makeup Artist
Burness Dembrowski
Sound Editor
Robert Stadd
Visual Effects Producer
Henry Shaffer
Art Direction
Dana Lyman
Costume Design
Mike Chock
Sound Editor
Richard L. Anderson
Supervising Sound Editor
Patricia Grande
Hairstylist
Paul Huntley
Wigmaker
Robert C. Goldstein
Art Direction
Bill Forsche
Special Effects Makeup Artist
Jim Stephan
Stunts
Sharon Gerhard
Second Assistant Director
John Borland
Stunts
Dean Raphael Ferrandini
Stunts
George P. Wilbur
Stunts
Richard W. Abramitis
First Assistant Director
Kurt D. Lott
Stunts
Gary Baxley
Stunts
Chuck Waters
Stunt Double
Jon R. Tower
Gaffer
Jay C. Currin
Stunts
Daniel W. Barringer
Stunts
Tom Morga
Stunts
Paul Baxley
Second Unit Director
Greg Cannom
Special Effects Makeup Artist
Lane Leavitt
Stunts
Steve Maslow
Sound Re-Recording Mixer
Bill Varney
Sound Re-Recording Mixer
Bob Minkler
Sound Re-Recording Mixer
Joanne D'Antonio
Sound Editor
Jeffrey Hayes
Sound
Carter DeHaven
Producer
Barry De Vorzon
Original Music Composer
Todd C. Ramsay
Editor
Thom Noble
Editor
Joe Roth
Executive Producer
Steve Jaffe
Associate Producer
James G. Robinson
Executive Producer
William Peter Blatty
Novel
Sharon Benson
Special Effects Coordinator