Warner Oland

Dr. Fu Manchu

Neil Hamilton

Dr. Jack Petrie

Jean Arthur

Lia Eltham

O. P. Heggie

Inspector Nayland Smith

William Austin

Sylvester Wadsworth

Claude King

Sir John Petrie

Charles A. Stevenson

General Petrie

Evelyn Selbie

Fai Lu

Noble Johnson

Li Po

Laska Winter

Fu Mela

Wong Chung

Chinese Official (uncredited)

Lawford Davidson

Chappell Dossett

Charles Giblyn

Donald MacKenzie