Gregory Peck

Robert Thorn

Lee Remick

Katherine Thorn

Harvey Stephens

Damien

David Warner

Jennings

Billie Whitelaw

Mrs. Baylock

Patrick Troughton

Father Brennan

Martin Benson

Father Spiletto

Robert Rietty

Monk

Tommy Duggan

Priest

John Stride

The Psychiatrist

Anthony Nicholls

Dr. Becker

Holly Palance

Nanny

Roy Boyd

Reporter

Freda Dowie

Nun

Sheila Raynor

Mrs. Horton

Robert MacLeod

Horton

Bruce Boa

Thorn's Aide

Don Fellows

Thorn's Second Aide