Max von Sydow Father Lankester Merrin
Ellen Burstyn Chris MacNeil
Linda Blair Regan MacNeil
Lee J. Cobb Lt. Bill Kinderman
Titos Vandis Uncle John
Donna Mitchell Mary Jo Perrin
William Friedkin Director
Jason Miller Father Damien Karras
Mercedes McCambridge Demon (voice)
Dan Perri Title Designer
Dick Smith Makeup Artist
Peter Masterson Dr. Barringer
Rudolf Schündler Karl
William Peter Blatty The Producer (uncredited), Producer, Novel, Screenplay
Rick Baker Special Effects Assistant
Robert Symonds Dr. Taney
Joseph M. Caracciolo Property Master
Jack Nitzsche Original Music Composer
Louis DiGiaimo Casting
Chris Newman Sound
Jack MacGowran Burke Dennings
Terence A. Donnelly First Assistant Director
Bernard Eismann Minor Role (uncredited)
Barton Heyman Dr. Klein
David Wynn-Jones Focus Puller
Kitty Winn Sharon Spencer
Roy Cooper Jesuit Dean
Owen Roizman Director of Photography
Eileen Dietz Demon / Regan Double (uncredited)
Nicholas Sgarro Script Supervisor
Juliet Taylor Casting
Bud S. Smith Editor
David Salven Associate Producer
Eugene Marks Music Editor
William A. Farley Hairstylist
Bill Malley Production Design
William O'Malley Father Joseph Kevin Dyer
Robert Gerringer Senator at Party
Josh Weiner Still Photographer
Noel Marshall Executive Producer
Wallace Rooney Bishop Michael
John Mahon Language Lab Director
Fred J. Brown Sound Effects Editor
Mary Boylan First Mental Patient (uncredited)
Nessa Hyams Casting
Joanne Dusseau Senator's Wife (uncredited)
Richard Quinlan Gaffer
Mason Curry Doctor (voice) (uncredited)
Barton Lane Angiography Doctor (uncredited)
Ron Faber Chuck / Demon (voice)
Ann Miles Spiderwalk (uncredited), Stunts
Dick Callinan Astronaut (uncredited)
Thomas Bermingham Tom
Evan A. Lottman Editor
Paul Bateson Radiologist's Assistant (uncredited)
Norman Gay Editor
Vasiliki Maliaros Mary Karras
Charles Bailey Assistant Art Director
Edward Garzero Scenic Artist
Toni Darnay Violent psychotic patient (uncredited)
Arthur Storch Psychiatrist
Ross Taylor Sound Effects Editor
Gina Petrushka Willi
Vincent Russell Subway Vagrant (uncredited)
C. Robert Fine Sound
Jerry Wunderlich Set Decoration
Marcel Vercoutere Special Effects
Rita Sakellariou (her voice on the radio)
Yvonne Jones Bellevue Nurse (uncredited)
Elinore Blair Nurse (uncredited)
Gerard F. Yates Priest Singing Around Piano at Party (uncredited)
Don LaBonte Minor Role (uncredited)