Al Pacino
Don Michael Corleone

Robert Duvall
Tom Hagen

Diane Keaton
Kay Corleone

Robert De Niro
Vito Corleone

John Cazale
Frederico 'Fredo' Corleone

Talia Shire
Constanzia 'Connie' Corleone

Lee Strasberg
Hyman Roth

Michael V. Gazzo
Frank Pentangeli

G. D. Spradlin
Senator Pat Geary

Richard Bright
Al Neri

Gastone Moschin
Don Fanucci

Tom Rosqui
Rocco Lampone

Bruno Kirby
Young Clemenza

Frank Sivero
Genco Abbandando

Francesca De Sapio
Young Mama Corleone

Morgana King
Mama Corleone

Marianna Hill
Deanna Corleone

Leopoldo Trieste
Signor Roberto

Dominic Chianese
Johnny Ola

Amerigo Tot
Michael's Bodyguard

Troy Donahue
Merle Johnson

John Aprea
Young Tessio

Joe Spinell
William 'Willie' Cicci

Abe Vigoda
Salvatore 'Sal' Tessio

Tere Livrano
Theresa Hagen

Gianni Russo
Carlo Rizzi

Maria Carta
Mrs. Andolini

Fay Spain
Mrs. Marcia Roth

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

David Baker
F.B.I. Man #2

Carmine Caridi
Carmine Rosato

Danny Aiello
Tony Rosato

William Bowers
Senate Committee Chairman

Carmen Argenziano
Michael's Buttonman #2

Kathleen Beller
Girl in 'Senza Mamma'

Peter Donat
Questadt

Roger Corman
Senator #2

Ivonne Coll
Yolanda

Erica Yohn
Governess

James Caan
Sonny Corleone (uncredited)

Roman Coppola
Sonny Corleone as a Boy (uncredited)

Sofia Coppola
Child on Ship (uncredited)

Julie Gregg
Sandrinella 'Sandra' Corleone (uncredited)

Buck Houghton
Senator with Mustache (uncredited)

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

Gary Kurtz
Photographer in Court (uncredited)

Richard Matheson
Senator #3 (uncredited)

John Megna
Young Hyman Roth (uncredited)

Jay Rasumny
Street Vendor (uncredited)

Julian Voloshin
Sam Roth (uncredited)

Laura Lyons
Guest (uncredited)

Harrison Ressler
Crowd (uncredited)