Gregory Peck (Robert Thorn), Lee Remick (Katherine Thorn), David Warner (Keith Jennings), Billie Whitelaw (Mrs. Baylock), Harvey Stephens (Damien), Patrick Troughton (Pater Brennan), Martin Benson (Pater Spiletto), Robert Rietty (Mönch), Tommy Duggan (Priester), John Stride (Psychiater), Don Fellows (Thorns zweiter Helfer), Bruce Boa (Thorns Helfer), Anthony Nicholls (Dr. Becker), Nicholas Campbell (Marine), Holly Palance (Kindermädchen), Leo McKern (Carl Bugenhagen), Roy Boyd (Reporter), Freda Dowie (Nonne), Betty McDowall (Amerikanische Sekretärin), Sheila Raynor (Mrs. Horton)