Gregory Peck character Robert Thorn
Lee Remick character Katherine Thorn
David Warner character Keith Jennings
Billie Whitelaw character Mrs. Baylock
Harvey Stephens character Damien
Patrick Troughton character Father Brennan
Martin Benson character Father Spiletto
Robert Rietti character Monk
Tommy Duggan character Priest
John Stride character Psychiatrist
Holly Palance character Young Nanny
Anthony Nicholls character Dr. Becker
Roy Boyd character Reporter
Sheila Raynor character Mrs. Horton
Robert MacLeod character Horton
Bruce Boa character Thorn's Aide
Don Fellows character Thorn's Second Aide
Patrick McAlinney character Photographer
Dawn Perllman character Chambermaid
Nancy Mannigham character Nurse
Miki Iveria character First Nun
Betty McDowall character American Secretary
Nicholas Campbell character Marine
Burnell Tucker character Secret Service Man (uncredited)
Ronald Leigh-Hunt character Gentleman at Rugby Match (uncredited)
Guglielmo Spoletini character Italian Taxi Driver (uncredited)
Freda Dowie character Nun (uncredited)
Ya'ackov Banai character Arab (uncredited)
Harvey Bernhard character Man walking across street (uncredited)
Michael Byrne character Monk (uncredited)
Leo McKern character Carl Bugenhagen (uncredited)
Bill Reimbold character General (uncredited)
