Gregory Peck as Robert Thorn

Lee Remick as Katherine Thorn

David Warner as Keith Jennings

Billie Whitelaw as Mrs. Baylock

Harvey Stephens as Damien Thorn

Patrick Troughton as Father Brennan

Martin Benson as Father Spiletto

Robert Rietti as Monk

Tommy Duggan as Priest

John Stride as Psychiatrist

Holly Palance as Young Nanny

Anthony Nicholls as Dr. Becker

Roy Boyd as Reporter

Sheila Raynor as Mrs. Horton

Robert MacLeod as Horton

Bruce Boa as Thorn's Aide

Don Fellows as Thorn's Second Aide

Patrick McAlinney as Photographer

Dawn Perllman as Chambermaid

Nancy Mannigham as Nurse

Miki Iveria as First Nun

Betty McDowall as American Secretary

Nicholas Campbell as Marine

Burnell Tucker as Secret Service Man (uncredited)

Ronald Leigh-Hunt as Gentleman at Rugby Match (uncredited)

Guglielmo Spoletini as Italian Taxi Driver (uncredited)

Freda Dowie as Nun (uncredited)

Ya'ackov Banai as Arab (uncredited)

Harvey Bernhard as Man walking across street (uncredited)

Michael Byrne as Monk (uncredited)

Leo McKern as Carl Bugenhagen (uncredited)

Bill Reimbold as General (uncredited)

Michael Leader as Rugby Match Spectator (uncredited)

Mary Burleigh as Rugby Match Spectator (uncredited)

Ann Barrass as Guest at Damien’s birthday party

Mark Baxter as Boy (uncredited)

Victor Harrington as Monk (uncredited)

Suzanne Heimer as Rugby match spectator

Walter Henry as Hospital Orderly

Trevor Wedlock as Man buying ice cream at Safari Park (uncredited)