Tom Tryon (Stephen Fermoyle)
Carol Lynley (Mona/Regina Fermoyle)
Romy Schneider (Annemarie)
Dorothy Gish (Celia)
Maggie McNamara (Florrie)
John Huston (Cardinal Glennon)
Raf Vallone (Cardinal Quarenghi)
Dino DiLuca (Italian Monsignor)
Eric Frey (Seyss-Inquart)
Wolfgang Preiss (S.S. Major)
Tullio Carminatti (Cardinal Giacobbi)
Vilma Degischer (Sister Wilhelmina)
Joseph Meinrad (Cardinal Innitzer)
Rudolph Foster (Drunk Man at the Ball)
Matthias Fuchs (Father Neidermoser)
Billie Hayes (Frank)
Jose Duvall (Ramon Gongaro)
Peter MacLean (Father Callahan)
Robert Morse (Bobby and His Adora-Belles)
Pat Henning (Hercule Menton)
Burgess Meredith (Father Ned Halley)
Jill Haworth (Lalage Menton)
Russ Brown (Dr. Heller)
Ossie Davis (Father Gillis)
Donald Hayne (Father Eberling)
Chill Wills (Monsignor Whittle)
Arthur Hunnicutt (Sheriff Dubrow)
Doro Merande (Woman Picket)
Patrick O'Neal (Cecil Turner)
Murray Hamilton (Lafe)
Peter Weck (Kurt von Hartman)
Cameron Prud'Homme (Din)
John Saxon (Benny Rampell)
Cecil Kellaway (Monsignor Monaghan)
Loring Smith (Cornelius J. Deegan)