 Dick PowellPhilip Marlowe | Philip Marlowe |
 Claire TrevorHelen Grayle | Helen Grayle |
 Anne ShirleyAnn Grayle | Ann Grayle |
 Otto KrugerJules Amthor | Jules Amthor |
 Mike MazurkiJoe "Moose" Malloy | Joe "Moose" Malloy |
 Miles ManderLeuwen Grayle | Leuwen Grayle |
 Douglas WaltonLindsay Marriott | Lindsay Marriott |
 Donald DouglasPolice Lt. Randall | Police Lt. Randall |
 Ralf HaroldeDr. Sonderborg | Dr. Sonderborg |
 Esther HowardJesse Florian | Jesse Florian |
 Ernie AdamsBartender at "Florian's" (uncredited) | Bartender at "Florian's" (uncredited) |
| BBernice AhiDancer at the "Cocoanut Beach Club" (uncredited) | Dancer at the "Cocoanut Beach Club" (uncredited) |
| GGeorge AndersonDetective (uncredited) | Detective (uncredited) |
| EEdward BibyClub Patron (uncredited) | Club Patron (uncredited) |
| JJack CarrDr. Sonderborg's Assistant (uncredited) | Dr. Sonderborg's Assistant (uncredited) |
| TTom ColemanPolice Clerk (uncredited) | Police Clerk (uncredited) |
 Ralph DunnDetective (uncredited) | Detective (uncredited) |
| SSam FinnHeadwaiter (uncredited) | Headwaiter (uncredited) |
| RRudy GermaneClub Patron (uncredited) | Club Patron (uncredited) |
 Fred GrahamMan (uncredited) | Man (uncredited) |
| BBill HamiltonMan (uncredited) | Man (uncredited) |
| PPaul HiltonBoy Getting Laundry (uncredited) | Boy Getting Laundry (uncredited) |
| JJohn IndrisanoAmthor's Chauffeur (uncredited) | Amthor's Chauffeur (uncredited) |
 Daun KennedyGirl in Bar (uncredited) | Girl in Bar (uncredited) |
 Donald KerrTaxi Driver (uncredited) | Taxi Driver (uncredited) |
| KKing LockwoodClub Patron (uncredited) | Club Patron (uncredited) |
| PPaul PhillipsDetective Nulty (uncredited) | Detective Nulty (uncredited) |
 Dewey RobinsonNew Boss at "Florian's" (uncredited) | New Boss at "Florian's" (uncredited) |
 Shimen RuskinElevator Operator (uncredited) | Elevator Operator (uncredited) |
 Larry WheatGrayle's Butler (uncredited) | Grayle's Butler (uncredited) |
