George C. Scott
Lt. William 'Bill' Kinderman
Acting
Ed Flanders
Father Joseph Kevin Dyer
Acting
Brad Dourif
James Venamun / The Gemini Killer
Acting
Jason Miller
Father Damien Karras / Patient X
Acting
Nicol Williamson
Father Morning
Acting
Scott Wilson
Dr. Temple
Acting
Nancy Fish
Nurse Allerton
Acting
George DiCenzo
Stedman
Acting
Don Gordon
Ryan
Acting
Lee Richardson
University President
Acting
Grand L. Bush
Sergeant Atkins
Acting
Mary Jackson
Mrs. Clelia
Acting
Viveca Lindfors
Nurse X
Acting
Ken Lerner
Dr. Freedman
Acting
Tracy Thorne
Nurse Keating
Acting
Barbara Baxley
Shirley
Acting
Zohra Lampert
Mary Kinderman
Acting
Harry Carey, Jr.
Father Kanavan
Acting
Sherrie Wills
Julie Kinderman
Acting
Edward Lynch
Patient A
Acting
Clifford David
Dr. Bruno
Acting
Alex Zuckerman
Korner Boy
Acting
Lois Foraker
Nurse Merrin
Acting
Tyra Ferrell
Nurse Blaine
Acting
James Burgess
Thomas Kintry
Crew
Kevin Corrigan
Altar Boy
Acting
Peggy Alston
Mrs. Kintry
Acting
John Durkin
Elderly Jesuit
Acting
Bobby Deren
Nurse Bierce
Acting
Jan Neuberger
Alice
Acting
Alexis Chieffet
Counter Attendant
Acting
Debra Port
Waitress
Acting
Walt MacPherson
Police Sergeant
Acting
David Dwyer
Second Police Officer
Acting
Danny Epper
Police Driver
Crew
William Preston
Old Man in Wheelchair
Acting
Chuck Kinlaw
Attendant
Acting
Demetrios Pappageorge
Casperelii
Acting
Nina Hansen
Little Old Lady
Acting
Samuel L. Jackson
Dream Blind Man
Acting
Shane Wexel
First Dream Boy (uncredited)
Acting
Ryan Paul Amick
Second Dream Boy (uncredited)
Acting
John Coe
Old Man in Dream (uncredited)
Acting
Jodi Long
First Dream Woman (uncredited)
Acting
Kathy Gerber
Second Dream Woman (uncredited)
Acting
Jan Smook
Radio Man (uncredited)
Acting
Amelia Campbell
Young Girl in Dream (uncredited)
Acting
Cherie Baron
Nurse
Acting
Larry King
Larry King
Acting
C. Everett Koop
Everett Koop
Acting
Patrick Ewing
Angel of Death
Acting
Clinton Brandhagen
Young Boy in Dream (uncredited)
Acting
Michael Criscuolo
Mental Patient (uncredited)
Acting
Cindy Cullom
Nurse (uncredited)
Acting
Colleen Dewhurst
Satan (voice) (uncredited)
Acting
Fabio
Angel (uncredited)
Acting
Randy Aaron Fink
Student (uncredited)
Acting
Jeff Henry
Angel (uncredited)
Acting
Patt Noday
Hospital Ward Priest (uncredited) (unconfirmed)
Acting
Manley Pope
Angel (uncredited)
Acting
John Thompson
John Thompson - Georgetown Hoyas Basketball Coach (uncredited)
Acting
Michael Tove
Man in Purgatory (uncredited)
Acting
Brad Waller
Asylum Inmate (uncredited)
Acting
Gary Wheeler
Crime Photographer (uncredited)
Acting
Teresa Wright
Penitent (uncredited)
Acting
Charles Edwin Powell
Patient X Possessed
Acting