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