 | Morgan Conway | ... | Dick Tracy |

| Anne Jeffreys | ... | Tess Trueheart / Blythe Belmonte |
 | Lyle Latell | ... | Pat Patton |
 | Rita Corday | ... | Mona Clyde, Sparkle's Secretary |
 | Ian Keith | ... | Vitamin Flintheart |
 | Dick Wessel | ... | Harry 'Cueball' Lake |
 | Douglas Walton | ... | Percival Priceless, Antique Store Owner |
 | Esther Howard | ... | Filthy Flora, Dripping Dagger Proprietor |
 | Joseph Crehan | ... | Chief Brandon |
 | Byron Foulger | ... | Simon Little, Sparkle's Diamond Cutter |
 | Jimmy Crane | ... | Junior Tracy |
 | Milton Parsons | ... | Higby, Clerk at Priceless' |
 | Skelton Knaggs | ... | Rudolph, Little's Assoicate |
| rest of cast listed alphabetically: |
 | Trevor Bardette | ... | Lester Abbott, Passenger with Diamonds (uncredited) |
 | Jack Cheatham | ... | Cop (uncredited) |
 | Harry Cheshire | ... | Jules Sparkle, Jeweler (uncredited) |
 | Jimmy Clemons Jr. | ... | Butch, Junior's Pal (uncredited) |
 | Ralph Dunn | ... | Cop at Pat's Car Wreck (uncredited) |
 | Lee Frederick | ... | Purser, S.S. 'Palomar' (uncredited) |
 | Raoul Freeman | ... | Cop (uncredited) |
 | Kit Guard | ... | Bar Customer (uncredited) |
 | Perc Launders | ... | Police Sergeant (uncredited) |
 | William Newell | ... | Piano Player (uncredited) |
 | Jason Robards Sr. | ... | Captain Mason, S.S. 'Palomar' (uncredited) |
 | Max Wagner | ... | Max, Dripping Dagger Bartender (uncredited) |
 | Bill Wallace | ... | Carlton Arms Doorman (uncredited) |
 | Phil Warren | ... | Coroner at Abbott's Autopsy (uncredited) |