Christopher Reeve

as Father John Flaherty

Geneviève Bujold

as Clara

Fernando Rey

as Cardinal Santoni

Jason Miller

as Don Vito Appolini

Adolfo Celi

as Cardinal Vinci

Leonardo Cimino

as The Pope

Tomas Milian

as Father Francisco

Robert Prosky

as Bishop Walkman

Joe Pantoliano

as Pvt. Joe Musso

Milena Vukotić

as Sister Verna

Ian Danby

as Lieutenant

Harrison Muller Jr.

as 2nd Soldier

David Mills

as Major

Joe Cortese

as Ludovico 'Lodo' Varese

Gregory Snegoff

as 1st Soldier

Joe Spinell

as Bride's Father

Pamela Prati

as 1st Roman Girl

Ritza Brown

as Maid of Honor

Loredana Grappasonni

as Bride

Ettore Mattia

as Pietro

Carolyn De Fonseca

as 1st Flaherty Secretary

Yanti Somer

as 2nd Flaherty Secretary

Mimmo Poli

as Sicilian Priest

Anny Papa

as 2nd Roman Girl

Stefania D'Amario

as 3rd Roman Girl

Elio Bonadonna

as 1st Killer

Giovanni Bonadonna

as 2nd Killer

Remo De Angelis

as 3rd Killer

Michele Messina

as 1st Sicilian Guard

Agnès Nobecourt

as 1st Postulant

Tracy Bonbrest

as 2nd Postulant

Paolo Maria Scalondro

as Clerical Secretary

Franco Angrisano

as Priest in Confessional

Tom Felleghy

as Priest

Alfonso Giganti

as Cardinal

Antonio Marcolini

as Cardinal

Amedeo Salamon

as Cardinal

Lamberto Solfa

as Cardinal

Paul Müller

as Priest

Franca Scagnetti

as Don Appolini's Maid