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| Humphrey Bogart | Private Detective Sam Spade |
| Mary Astor | Brigid O'Shaughnessy |
| Peter Lorre | Joel Cairo |
| Gladys George | Iva Archer |
| Barton MacLane | Det. Lt. Dundy |
| Sydney Greenstreet | Kasper Gutman |
| Lee Patrick | Effie Perine |
| Ward Bond | Det. Tom Polhaus |
| Jerome Cowan | Miles Archer |
| Elisha Cook Jr. | Wilmer Cook |
| James Burke | Luke |
| Murray Alper | Frank Richman |
| John Hamilton | Bryan |
| Walter Huston | Capt. Jacobi (uncredited) |
| Emory Parnell | Ship's mate (uncredited) |
| Robert Homans | Policeman (uncredited) |
| Creighton Hale | Stenographer (uncredited) |
Private eye Sam Spade encounters sundry characters, all seeking a coveted statuette.
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