 Edward G. RobinsonCaesar Enrico 'Rico' Bandello aka 'Little Caesar' | Caesar Enrico 'Rico' Bandello aka 'Little Caesar' |
 Douglas Fairbanks Jr.Joe Massara | Joe Massara |
 Glenda FarrellOlga Stassoff | Olga Stassoff |
 William Collier Jr.Tony Passa | Tony Passa |
 Sidney BlackmerBig Boy | Big Boy |
 Ralph IncePete Montana | Pete Montana |
 Thomas E. JacksonSgt. Flaherty | Sgt. Flaherty |
 Stanley FieldsSam Vettori | Sam Vettori |
 Maurice BlackLittle Arnie Lorch | Little Arnie Lorch |
 George E. StoneOtero | Otero |
 Armand KalizDe Voss | De Voss |
| NNicholas BelaRitz Colonna | Ritz Colonna |
 Ernie AdamsCashier (uncredited) | Cashier (uncredited) |
| EElmer BallardBat Carilla (uncredited) | Bat Carilla (uncredited) |
 Ferike BorosMrs. Passa (uncredited) | Mrs. Passa (uncredited) |
 Kernan CrippsDetective (uncredited) | Detective (uncredited) |
| GGeorge DalyMachine-Gunner (uncredited) | Machine-Gunner (uncredited) |
 Adolph FaylauerNew Year's Celebrant (uncredited) | New Year's Celebrant (uncredited) |
 Ben Hendricks Jr.Kid Bean (uncredited) | Kid Bean (uncredited) |
 Al HillRico's 'Butler' (uncredited) | Rico's 'Butler' (uncredited) |
 Lucille La VerneMa Magdalena (uncredited) | Ma Magdalena (uncredited) |
| GGladys LloydMcClure Guest (uncredited) | McClure Guest (uncredited) |
 Noel MadisonKiller Peppi (uncredited) | Killer Peppi (uncredited) |
 Tom McGuireDetective on Phone (uncredited) | Detective on Phone (uncredited) |
 Louis NatheauxHood (uncredited) | Hood (uncredited) |
 William H. O'BrienWaiter (uncredited) | Waiter (uncredited) |
| HHenry SedleyScabby (uncredited) | Scabby (uncredited) |
| GGay SheridanNightclub Patron (uncredited) | Nightclub Patron (uncredited) |
 Larry SteersMcClure Guest (uncredited) | McClure Guest (uncredited) |
 Landers StevensAlvin McClure - Crime Commissioner (uncredited) | Alvin McClure - Crime Commissioner (uncredited) |
