 | Clint Eastwood als Jonathan Hemlock |
 | George Kennedy als Ben Bowman |
 | Vonetta McGee als Jemima Brown |
 | Jack Cassidy als Miles Mellough |
 | Heidi Brühl als Mrs. Montaigne |
 | Thayer David als Dragon |
 | Reiner Schöne als Freytag |
 | Michael Grimm als Meyer |
 | Jean-Pierre Bernard als Montaigne |
 | Brenda Venus als George |
 | Gregory Walcott als Pope |
 | Candice Rialson als Art Student |
| Elaine Shore als Miss Cerberus |
| Dan Howard als Dewayne |
| Jack Kosslyn als Reporter |
| Walter Kraus als Kruger |
| Frank Redman als Wormwood |
| Siegfried Wallach als Hotel Manager |
| Susan Morgan Cooper als Buns |
| Jack Frey als Cab Driver |
 | Philippe Mareuil als Doublure voix française de Jack Cassidy |
| Frank Stanley | Director of Photography |
| Trevanian | Screenplay |
| Warren Murphy | Screenplay |
| Robert Daley | Producer |
| Trevanian | Novel |
| Ferris Webster | Editor |
| Hal Dresner | Screenplay |
| John Williams | Original Music Composer |
| Clint Eastwood | Director |
| David Brown | Executive Producer |
| Richard D. Zanuck | Executive Producer |
| George C. Webb | Art Direction |
| James R. Alexander | Sound |
| Fred R. Simpson | Unit Production Manager |
| John Dwyer | Set Decoration |
| Aurelio Crugnola | Art Direction |
| James Fargo | First Assistant Director |
| Craig Huston | Second Assistant Director |
| Victor Tourjansky | Second Assistant Director |
| Jack Kosslyn | Dialogue Coach |
| Joe McKinney | Makeup Artist |
| Janice Clark | Hairstylist |
| Agnese Panarotto | Hairstylist |
| Carol Rydall | Production Secretary |
| Tom Moore | Script Supervisor |
| William N. Clark | Camera Operator |
| Frank Redman | Assistant Camera |
| Bruce Catlin | Assistant Camera |
| Bud Howell | Key Grip |
| Ben McMahan | Special Effects |
| Buddy Bowles | Gaffer |
| Tim Ryan | Grip |
| Jim Porter | Best Boy Grip |
| Larry Bird | Property Master |
| Joe Chevalier | Property Master |
| Charles Waldo | Wardrobe Designer |
| Glenn Wright | Costume Supervisor |
| Frank Balchus | Wardrobe Intern |
| Sheila Mason | Wardrobe Intern |
| Bona Nasalli-Rocca | Wardrobe Intern |
| Nefte Riccò | Seamstress |
| Art Rimdzius | Transportation Captain |
| Richard C. Meyer | Assistant Editor |
| Roberto Silvi | Assistant Editor |
| Don Christie | Still Photographer |
| Mario Pisani | Unit Manager |
| Laura Fattori | Production Secretary |
| Wallace Worsley Jr. | Unit Production Manager |
| Robert L. Hoyt | Sound Recordist |
| Buddy Van Horn | Stunts |
