Buster Crabbe as Flash Gordon

Jean Rogers as Dale Arden

Frank Shannon as Dr. Zarkov

Charles Middleton as Emperor Ming

Beatrice Roberts as Queen Azura

Donald Kerr as Happy Hapgood

Richard Alexander as Prince Barin

C. Montague Shaw as Clay King

Wheeler Oakman as Tarnak

Kane Richmond as Stratosled Pilot (Talgon's Brother)

Warner Richmond as Zandar

Anthony Warde as King Turan of the Forest People

Kenne Duncan as Airdrome Captain

Jack Mulhall as Bomber Captain

Lane Chandler as Flight Commander

Ben Lewis as Professor