Al Pacino as Don Michael Corleone

Robert Duvall as Tom Hagen

Diane Keaton as Kay Corleone

Robert De Niro as Vito Corleone

John Cazale as Frederico 'Fredo' Corleone

Talia Shire as Constanzia 'Connie' Corleone

Lee Strasberg as Hyman Roth

Michael V. Gazzo as Frank Pentangeli

G. D. Spradlin as Senator Pat Geary

Richard Bright as Al Neri

Gastone Moschin as Don Fanucci

Tom Rosqui as Rocco Lampone

Bruno Kirby as Young Clemenza

Frank Sivero as Genco Abbandando

Francesca De Sapio as Young Mama Corleone

Morgana King as Mama Corleone

Marianna Hill as Deanna Corleone

Leopoldo Trieste as Signor Roberto

Dominic Chianese as Johnny Ola

Amerigo Tot as Michael's Bodyguard

Troy Donahue as Merle Johnson

John Aprea as Young Tessio

Joe Spinell as William 'Willie' Cicci

Abe Vigoda as Salvatore 'Sal' Tessio

Tere Livrano as Theresa Hagen

Gianni Russo as Carlo Rizzi

Maria Carta as Mrs. Andolini

Oreste Baldini as Young Vito

Giuseppe Sillato as Don Francesco Ciccio

Mario Cotone as Don Tommasino

James Gounaris as Anthony Corleone

Fay Spain as Mrs. Marcia Roth

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

David Baker as F.B.I. Man #2

Carmine Caridi as Carmine Rosato

Danny Aiello as Tony Rosato

Carmine Foresta as Policeman

Nick Discenza as Bartender

Joseph Medaglia as Father Carmelo

William Bowers as Senate Committee Chairman

Joseph Della Sorte as Michael's Buttonman #1

Carmen Argenziano as Michael's Buttonman #2

Joe Lo Grippo as Michael's Buttonman #3

Ezio Flagello as Impressario

Livio Giorgi as Tenor in 'Senza Mamma'

Kathleen Beller as Girl in 'Senza Mamma'

Saveria Mazzola as Signora Colombo

Tito Alba as Cuban President

Johnny Naranjo as Cuban Translator

Elda Maida as Pentangeli's Wife

Salvatore Po as Pentangeli's Brother

Ignazio Pappalardo as Mosca

Andrea Maugeri as Strollo

Peter LaCorte as Signor Abbandando

Vincent Coppola as Street Vendor

Peter Donat as Questadt

Tom Dahlgren as Fred Corngold

Paul B. Brown as Senator Ream

Phil Feldman as Senator #1

Roger Corman as Senator #2

Ivonne Coll as Yolanda

Joe De Nicola as Attendant at Brothel

Edward Van Sickle as Ellis Island Doctor

Gabriella Belloni as Ellis Island Nurse

Richard Watson as Customs Official

Venancia Grangerard as Cuban Nurse

Erica Yohn as Governess

Teresa Tirelli as Midwife

James Caan as Sonny Corleone (uncredited)

Italia Coppola as Mama Corleone's Body (uncredited)

Roman Coppola as Sonny Corleone as a Boy (uncredited)

Sofia Coppola as Child on Ship (uncredited)

Victor Pujols Faneyte as Cuban Guerilla with Grenade (uncredited)

Julie Gregg as Sandrinella 'Sandra' Corleone (uncredited)

Larry Guardino as Vito's Uncle (uncredited)

Buck Houghton as Senator with mustache (uncredited)

Sho Kosugi as Passerby in Coat with Cap Pulled Down (uncredited)

Gary Kurtz as Photographer in Court (uncredited)

Richard Matheson as Senator #3 (uncredited)

John Megna as Young Hyman Roth (uncredited)

Jay Rasumny as Street Vendor (uncredited)

Filomena Spagnuolo as Extra in Little Italy (uncredited)

Julian Voloshin as Sam Roth (uncredited)

Devi Morgan as Background (uncredited)