- Raf Vallone - Cardinal Lamberto
- Franc D'Ambrosio - Anthony Corleone
- Donal Donnelly - Archbishop Gilday
- Richard Bright - Al Neri
- Helmut Berger - Frederick Keinszig
- Don Novello - Dominic Abbandando
- John Savage - Father Andrew Hagen
- Franco Citti - Calo
- Mario Donatone - Mosca
- Vittorio Duse - Don Tommasino
- Enzo Robutti - Don Licio Lucchesi
- Michele Russo - Spara
- Al Martino - Johnny Fontane
- Robert Cicchini - Lou Pennino
- Rogerio Miranda - Twin Bodyguard Armand
- Carlos Miranda - Twin Bodyguard Francesco
- Vito Antuofermo - Anthony 'The Ant' Squigliaro
- Robert Vento - Father John
- Willie Brown - Party Politician
- Jeannie Linero - Lucy Mancini
- Jeanne Savarino Pesch - Francesca Corleone
- Janet Savarino Smith - Kathryn Corleone
- Tere Livrano - Teresa Hagen
- Carmine Caridi - Albert Volpe
- Don Costello - Frank Romano
- Al Ruscio - Leo Cuneo
- Mickey Knox - Marty Parisi
- Rick Aviles - Mask #1
- Michael Bowen - Mask #2
- Brett Halsey - Douglas Michelson
- Gabriele Torrei - Enzo the Baker
- Brian Freilino - Stockholder
- Gregory Corso - Unruly Stockholder
- Marino Masé - Lupo
- Dado Ruspoli - Vanni
- Valeria Sabel - Sister Vincenza
- Remo Remotti - Cardinal Sistine
- Luigi Laezza - Keinszig Killer
- Giuseppe Pianviti - Keinszig Killer
- Santo Indelicato - Guardia del Corpo
- Simonetta Stefanelli - Apollonia Vitelli-Corleone
- Francesco Paolo Bellante - Autista di Don Tommasino
- Paco Reconti - Gesu
- Mimmo Cuticchio - Puppet Narrator
- Richard Honigman - Party Reporter
- Nicky Blair - Nicky the Casino Host
- Anthony Guidera - Anthony, the Bodyguard
- Frank Tarsia - Frankie, the Bodyguard
- Diana Agostini - Woman with Child at Street Fair
- Jessica DiCicco - Child (as Jessica Di Ciccio)
- Catherine Scorsese - Woman in Cafe
- Ida Bernardini - Woman in Cafe
- Joe Drago - Party Security
- James D. Damiano - Son Playing Soccer
- Michael Boccio - Father of Soccer Player
- Ludovico Caldarera - Young Priest (uncredited)
- R. Emmett Fitzsimmons - Mob Boss (uncredited)
- Sal Borgese - Lucchesi Guard (uncredited)
- Salvatore Billa - Lucchesi Guard (uncredited)
- Frank Ferrara - Zasa's Bodyguard (uncredited)
- Joe Fontana - St. Gennaro Feast Mob Guy (uncredited)
- Richard Maldone - Zasa's Bodyguard (uncredited)
- Tony Devon - Mob Family Lawyer at Church (uncredited)
- Anton Coppola - Conductor (uncredited)
- Ron Jeremy - Man Chewing Toothpick (uncredited)
- David L. Thompson - Party Guest (uncredited)
- Angelo Romero - Alfio (uncredited)
- Madelyn Renée Monti - Lola (singing voice)
- Luciano Foti - Audience Member (uncredited)
- Frank Albanese - Grand Marshall at St. Gennaro Feast (uncredited)
- John Abineri - Hamilton Banker
- Pietro Torrisi - Guard at Meeting (uncredited)
- Angelo Ragusa - Guard at Meeting (uncredited)
- Claudio Zucchet - Guard at Meeting (uncredited)
- Omero Capanna - Guard at Meeting (uncredited)
- Sergio Smacchi - Guard at Meeting (uncredited)
- Angelo Boscariol - Mobster at Meeting (uncredited)
- Enrico Cesaretti - Stockholder (uncredited)
- Aldo Formisano - Mafia Boss (uncredited)
- Umberto De Luca - Guard at Meeting (uncredited)
- Wilma Garscadden-Gahret
- Francis Ford Coppola
- Gray Frederickson
- Janet Hirshenson
- Fred Fuchs
- Jane Jenkins
- Tom Myers
- Marian Wilde
- Carmine Coppola
- Robert Shoup
- Tim Holland
- Bob Baron
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