 | Christopher Reeve als Father John Flaherty |
 | Geneviève Bujold als Clara |
 | Fernando Rey als Cardinal Santoni |
 | Jason Miller als Don Vito Appolini |
 | Adolfo Celi als Cardinal Vinci |
 | Leonardo Cimino als The Pope |
 | Tomas Milian als Father Francisco |
 | Robert Prosky als Bishop Walkman |
 | Joe Pantoliano als Pvt. Joe Musso |
 | Milena Vukotić als Sister Verna |
 | Ian Danby als Lieutenant |
 | Harrison Muller Jr. als 2nd Soldier |
| David Mills als Major |
 | Joe Cortese als Ludovico 'Lodo' Varese |
 | Gregory Snegoff als 1st Soldier |
 | Joe Spinell als Bride's Father |
| Pamela Prati als 1st Roman Girl |
| Frank Perry | Director |
| Abraham Polonsky | Screenplay |
| Jack-Alain Léger | Novel |
| Wendell Mayes | Screenplay |
| Gianni Cozzo | Assistant Director |
| Carlo Gervasi | Set Decoration |
| Francesca Roberti | Script Supervisor |
| Mike Fenton | Casting |
| Kurt Neumann | Production Manager |
| Roy Charman | Sound mixer |
| Jane Feinberg | Casting |
| Franco Corridoni | Makeup Artist |
| Kurt Neumann | Associate Producer |
| David M. Ice | Sound Effects Editor |
| Luigi Rocchetti | Makeup Artist |
| Billy Williams | Director of Photography |
| Frank Yablans | Producer |
| John Williams | Original Music Composer |
| Peter E. Berger | Editor |
| Theoni V. Aldredge | Costume Design |
| Chic Anstiss | Camera Operator |
| David Niven Jr. | Producer |
| Stefano Maria Ortolani | Art Direction |
| John DeCuir Jr. | Production Design |
| Paolo Fabbri | Location Manager |
| Maria Teresa Corridoni | Hairstylist |
| Joe Chevalier | Set Decoration |
| William Hartman | Sound Effects Editor |
| Aldo De Martino | Boom Operator |
