- Saul Bass
- titles
- Don Nivardo Buttarazzi
- abbot: Abbey at Casamari
- Donald Hayne
- technical advisor
- Otto Preminger
- presenter
- Nat Rudich
- executive assistant to producer
- Don Raffaele Scaccia
- prior: Abbey at Casamari
- Buddy Schwab
- choreographer
- Max Slater
- dialogue coach
- René Arrieu
- french voice dubbing: Tom Tryon (uncredited)
- Cesare Barbetti
- italian voice dubbing: Peter Weck (uncredited)
- Fiorella Betti
- italian voice dubbing: Carol Lynley (uncredited)
- Teddy Bilis
- french voice dubbing: Burgess Meredith (uncredited)
- Lucien Bryonne
- french voice dubbing: Chill Wills (uncredited)
- Giorgio Capecchi
- italian voice dubbing: John Huston (uncredited)
- Marc Cassot
- french voice dubbing: Ossie Davis (uncredited)
- Gualtiero De Angelis
- italian voice dubbing: David Opatoshu (uncredited)
- Maria Pia Di Meo
- italian voice dubbing: Romy Schneider (uncredited)
- Ãmile Duard
- french voice dubbing: Russ Brown (uncredited)
- John Dunaway
- production secretary (uncredited)
- Fernand Fabre
- french voice dubbing: Pat Henning (uncredited)
- Lauro Gazzolo
- italian voice dubbing: Russ Brown (uncredited)
- Nando Gazzolo
- italian voice dubbing: Josef Meinrad (uncredited)
- Sergio Graziani
- italian voice dubbing: Patrick O´Neal (uncredited)
- Georges Hubert
- french voice dubbing: Cecil Kellaway (uncredited)
- Pino Locchi
- italian voice dubbing: Bill Hayes (uncredited)
- Michèle Montel
- french voice dubbing: Maggie McNamara (uncredited)
- Jean-Paul Moulinot
- french voice dubbing: Tullio Carminati (uncredited)
- Serge Nadaud
- french voice dubbing: John Huston (uncredited)
- Glauco Onorato
- italian voice dubbing: Ossie Davis (uncredited)
- Giulio Panicali
- italian voice dubbing: Chill Wills (uncredited)
- Bruno Persa
- italian voice dubbing: Murray Hamilton (uncredited)
- Alexandre Rignault
- french voice dubbing: Arthur Hunnicutt (uncredited)
- Giuseppe Rinaldi
- italian voice dubbing: Tom Tryon (uncredited)
- Georges Riquier
- french voice dubbing: Josef Meinrad (uncredited)
- Carlo Romano
- italian voice dubbing: Loring Smith (uncredited)
- Wanda Tettoni
- italian voice dubbing: Vilma Degischer (uncredited)
- Massimo Turci
- italian voice dubbing: John Saxon (uncredited)
- Serena Verdirosi
- italian voice dubbing: (uncredited)
- Hans Verner
- french voice dubbing: Peter Weck (uncredited)
- Jean Violette
- french voice dubbing: José Duvall (uncredited)