Ellen Burstyn
Chris MacNeil
Linda Blair
Regan MacNeil
Jason Miller
Father Damien Karras
Max von Sydow
Father Lankester Merrin
Lee J. Cobb
Lt. Bill Kinderman
William O'Malley
Father Joseph Kevin Dyer
Kitty Winn
Sharon Spencer
Jack MacGowran
Burke Dennings
Barton Heyman
Dr. Klein
Peter Masterson
Dr. Barringer
Rudolf Schündler
Karl
Gina Petrushka
Willi
Robert Symonds
Dr. Taney
Arthur Storch
Psychiatrist
Vasiliki Maliaros
Mary Karras
Titos Vandis
Uncle John
John Mahon
Language Lab Director
Wallace Rooney
Bishop Michael
Ron Faber
Chuck / Demon (voice)
Donna Mitchell
Mary Jo Perrin
Roy Cooper
Jesuit Dean
Robert Gerringer
Senator at Party
Mercedes McCambridge
Demon (voice)
Paul Bateson
Radiologist's Assistant (uncredited)
Elinore Blair
Nurse (uncredited)
William Peter Blatty
The Producer (uncredited)
Mary Boylan
First Mental Patient (uncredited)
Dick Callinan
Astronaut (uncredited)
Mason Curry
Doctor (voice) (uncredited)
Toni Darnay
Violent psychotic patient (uncredited)
Eileen Dietz
Demon / Regan Double (uncredited)
Joanne Dusseau
Senator's Wife (uncredited)
Bernard Eismann
Minor Role (uncredited)
Beatrice Hunter
Minor Role (uncredited)
Yvonne Jones
Bellevue Nurse (uncredited)
Don LaBonte
Minor Role (uncredited)
Barton Lane
Angiography Doctor (uncredited)
Ann Miles
Spiderwalk (uncredited)
John Nicola
Priest (uncredited)
Vincent Russell
Subway Vagrant (uncredited)
Gerard F. Yates
Priest Singing Around Piano at Party (uncredited)
Rita Sakellariou
(her voice on the radio)