Al PacinoDon Michael Corleone
Robert De NiroVito Corleone
John CazaleFrederico 'Fredo' Corleone
Talia ShireConstanzia 'Connie' Corleone
Michael V. GazzoFrank Pentangeli
G.D. SpradlinSenator Pat Geary
Gastone MoschinDon Fanucci
Bruno KirbyYoung Clemenza
Frank SiveroGenco Abbandando
Francesca De SapioYoung Mama Corleone
Morgana KingMama Corleone
Marianna HillDeanna Corleone
Leopoldo TriesteSignor Roberto
Dominic ChianeseJohnny Ola
Amerigo TotMichael's Bodyguard
Troy DonahueMerle Johnson
Joe SpinellWilliam 'Willie' Cicci
Abe VigodaSalvatore 'Sal' Tessio
Tere LivranoTheresa Hagen
Giuseppe SillatoDon Francesco Ciccio
Mario CotoneDon Tommasino
James GounarisAnthony Corleone
Fay SpainMrs. Marcia Roth
Harry Dean StantonF.B.I. Man #1
Carmine CaridiCarmine Rosato
Joseph MedagliaFather Carmelo
William BowersSenate Committee Chairman
Joseph Della SorteMichael's Buttonman #1
Carmen ArgenzianoMichael's Buttonman #2
Joe Lo GrippoMichael's Buttonman #3
Livio GiorgiTenor in 'Senza Mamma'
Kathleen BellerGirl in 'Senza Mamma'
Saveria MazzolaSignora Colombo
Johnny NaranjoCuban Translator
Elda MaidaPentangeli's Wife
Salvatore PoPentangeli's Brother
Peter LaCorteSignor Abbandando
Vincent CoppolaStreet Vendor
Tom DahlgrenFred Corngold
Paul B. BrownSenator Ream
Joe De NicolaAttendant at Brothel
Edward Van SickleEllis Island Doctor
Gabriella BelloniEllis Island Nurse
Richard WatsonCustoms Official
Venancia GrangerardCuban Nurse
James CaanSonny Corleone (uncredited)
Italia CoppolaMama Corleone's Body (uncredited)
Roman CoppolaSonny Corleone as a Boy (uncredited)
Sofia CoppolaChild on Ship (uncredited)
Victor Pujols FaneyteCuban Guerilla with Grenade (uncredited)
Julie GreggSandrinella 'Sandra' Corleone (uncredited)
Larry GuardinoVito's Uncle (uncredited)
Buck HoughtonSenator with Mustache (uncredited)
Sho KosugiPasserby in Coat with Cap Pulled Down (uncredited)
Gary KurtzPhotographer in Court (uncredited)
Richard MathesonSenator #3 (uncredited)
John MegnaYoung Hyman Roth (uncredited)
Jay RasumnyStreet Vendor (uncredited)
Filomena SpagnuoloExtra in Little Italy (uncredited)
Julian VoloshinSam Roth (uncredited)
Laura LyonsGuest (uncredited)
Harrison ResslerCrowd (uncredited)
Tony SiricoRosato Brothers Hood (uncredited)