Horatio 'Boston Blackie' Black
Chester Morris
Doris Howell
June Vincent
Insp. William R. Farraday
Richard Lane
Joan Howell (as Patricia White)
Patricia Barry
The Runt
George E. Stone
Sgt. Matthews
Frank Sully
Igor Borio
Edward Norris
Margie O'Reilly, alias Sandra Doray
Fay Baker