| Iva | Archer | Miles's wife. |
| Miles | Archer | Spade's partner. Deceased. |
| Phil | Archer | Mile's brother. |
| George | Arliss | A theatre actor. |
| Caroline | Beale | A burglar victim. |
| Joel | Cairo | Spade's client who's looking for a black bird figure. |
| Rhea | Cook | Wilmer's daughter. |
| Wilmer | Cook | Gutman's secretary. |
| Charles | Flitcraft | An automobile business owner. Spade's former client. |
| Mrs. | Flitcraft | Charles's wife. |
| Mr. | Freed | The hotel manager. |
| Casper | Gutman | A lawyer. Antagonist. |
| General | Kemidov | The black falcon owner. |
| Charilaos | Konstantinides | The Greek dealer who found the black falcon. |
| Dixie | Monahan | Thursby's boss. |
| Effie | Perine | Spade's secretary. |
| Tom | Polhaus | Dundy's partner. |
| Samuel | Spade | Protagonist. |
| Mr. | Thomas | Bryan's assistant. |
| Floyd | Thursby | Corinne's lover. |
| Francis | Vernev | The English adventurer. |
| Sid | Wise | Archer's lawyer. |
| Miss | Wonderly | Spade's client. Aka: Brigid O'Shaughnessy. |
| Bryan | | The district attorney. |
| Corinne | | Miss Wonderly's sister. Missing. |
| Dundy | | A lieutenant. |
| Harriman | | The house-detective on duty. |
| Healy | | Bryan's stenographer. |
| Icemidov | | The man who has the missing falcon. |
| Jacobi | | La Paloma's captain. |
| Luke | | The hotel-detective. |
| Ted | | Effie's uncle |
