Actor Character
Al Pacino Michael Corleone
Marlon Brando Don Vito Corleone
James Caan Santino 'Sonny' Corleone
Richard S. Castellano Pete Clemenza
Robert Duvall Tom Hagen
Sterling Hayden Capt. Mark McCluskey
Richard Conte Emilio Barzini
Al Lettieri Virgil 'Der Türke' Sollozzo
Diane Keaton Kay Adams
John Marley Jack Woltz