Chester Morris as Horatio 'Boston Blackie' Black

Maylia Fong as Mei Ling

Joan Woodbury as Red, the Bar-Girl

Don McGuire as Les, the Bus Guide

Richard Lane as Inspector William R. Farraday

Sid Tomack as The Runt

Frank Sully as Sergeant Matthews

Charles Arnt as Pop Gerard

Luis van Rooten as Bill Craddock (as Louis Van Rooten)

Philip Ahn as Wong Chung Shee

Benson Fong as Ah Hing

Victor Sen Yung as

Peter Brocco as Rolfe

Harry Strang as Mac

Pat O'Malley as Officer Jim

Edgar Dearing as Reiber