Robert Duvall - Tom Hagen

Diane Keaton - Kay Corleone

Robert De Niro - Don Vito Corleone

John Cazale - Fredo Corleone

Talia Shire - Connie Corleone

Lee Strasberg - Hyman Roth

Michael V. Gazzo - Frankie Pentangeli

G. D. Spradlin - Senator Pat Geary

Richard Bright - Al Neri

Francesca De Sapio - die Mutter des jungen Vito

Oreste Baldini - Vito Andolini as a Boy

Gastone Moschin - Don Fanucci

Giuseppe Sillato - Don Francesco Ciccio

Bruno Kirby - Young Clemenza

Frank Sivero - Genco

Morgana King - Mama Corleone

Marianna Hill - Deanna Corleone

Leopoldo Trieste - Signor Roberto

Dominic Chianese - Johnny Ola

Fay Spain - Mrs. Marcia Roth

Harry Dean Stanton - F.B.I. Man #1

Danny Aiello - Tony Rosato

Roger Corman - Senator #2

William Bowers - Senate Committee Chairman

James Caan - Sonny Corleone

Tom Rosqui - Rocco Lampone

Amerigo Tot - Michael's Bodyguard

Troy Donahue - Merle Johnson

John Aprea - Young Tessio

Joe Spinell - Willi Cicci

Abe Vigoda - Tessio

Tere Livrano - Theresa Hagen

Gianni Russo - Carlo

Maria Carta - Vito's mother

Mario Cotone - Don Tommasino

Carmine Caridi - Carmine Rosato

Carmine Foresta - Policeman

Kathleen Beller - Girl in 'Senza Mamma'

Ivonne Coll - Yolanda

Roman Coppola - Sonny Corleone as a Boy

Sofia Coppola - Child on Ship

Sho Kosugi - Passerby in Coat with Cap Pulled Down

James Gounaris - Anthony Corleone

Nick Discenza - Bartender

Joseph Medaglia - Father Carmelo

Joseph Della Sorte - Michael's Buttonman #1

Carmen Argenziano - Michael's Buttonman #2

Joe Lo Grippo - Michael's Buttonman #3

Ezio Flagello - Impressario

Livio Giorgi - Tenor in 'Senza Mamma'

Saveria Mazzola - Signora Colombo

Tito Alba - Cuban President

Johnny Naranjo - Cuban Translator

Elda Maida - Pentangeli's Wife

Salvatore Po - Pentangeli's Brother

Ignazio Pappalardo - Mosca

Andrea Maugeri - Strollo

Peter LaCorte - Signor Abbandando

Vincent Coppola - Street Vendor

Peter Donat - Questadt

Tom Dahlgren - Fred Corngold

Phil Feldman - Senator #1

Joe De Nicola - Attendant at Brothel

Edward Van Sickle - Ellis Island Doctor

Gabriella Belloni - Ellis Island Nurse

Venancia Grangerard - Cuban Nurse

G.D. Spradlin - Senator Pat Geary

Erica Yohn - Governess

Gary Kurtz - Photographer in Court (uncredited)

Connie Mason - (uncredited)

Frank Pesce - Extra (uncredited)

Victor Pujols Faneyte - Cuban Guerilla with Grenade (uncredited)

Julie Gregg - Sandra Corleone (uncredited)

Larry Guardino - Vito's Uncle (uncredited)

Buck Houghton - Senator with mustache (uncredited)

Richard Matheson - Senator #3 (uncredited)

John Megna - Young Hyman Roth (uncredited)

Jay Rasumny - Street Vendor (uncredited)

Filomena Spagnuolo - Extra in Little Italy (uncredited)

Julian Voloshin - Sam Roth (uncredited)

Shô Kosugi - Passerby in Coat with Cap Pulled Down (uncredited)

Roman Coppola - Sonny Corleone as a Boy (uncredited)

Italia Coppola - Mama Corleone's Body (uncredited)