Gregory Peck

Robert Thorn

Lee Remick

Katherine Thorn

David Warner

Jennings

Billie Whitelaw

Mrs. Baylock

Harvey Stephens

Damien

Patrick Troughton

Father Brennan

Martin Benson

Father Spiletto

Robert Rietti

Monk

Tommy Duggan

Priest

John Stride

The Psychiatrist

Anthony Nicholls

Dr. Becker

Holly Palance

Nanny