Warner Oland as Charlie Chan

Boris Karloff as Gravelle

Keye Luke as Lee Chan

William Demarest as Sergeant Kelly

Guy Usher as Inspector Regan

Margaret Irving as Mme. Lilli Rochelle

Gregory Gaye as Enrico Borelli

Nedda Harrigan as Mme. Lucretia Borelli

Frank Conroy as Mr. Whitely

Charlotte Henry as Mlle. Kitty

Thomas Beck as Phil Childers

Maurice Cass as Mr. Arnold

Tom McGuire as Pop Morris - Stage Doorman

Marc Lawrence as Undetermined Minor Role (uncredited) (unconfirmed)

Joan Woodbury as Dancer in Opera (uncredited)

William Bailey as Detective (uncredited)

Charles Bancroft as Soldier in Opera (uncredited)

John Bleifer as Murdered Orderly (uncredited)

Stanley Blystone as Backstage Cop Who Shoots Gravelle (uncredited)

Myrta Bonillas as Villager in Opera (uncredited)

Raymond Brown as Guard (uncredited)

Carita Crawford as Dancer in Opera (uncredited)

Patrick Cunning as Villager in Opera (uncredited)

Zari Elmassian as Mme. Rochelle (singing voice) (uncredited)

Frank Fanning as Cop (uncredited)

Jim Farley as Detective (uncredited)

Adolph Faylauer as Opera Spectator (uncredited)

Larry Fisher as Cop (uncredited)

Benson Fong as Opera Supernumerary (uncredited)

J. C. Fowler as Opera Spectator (uncredited)

Otto Fries as Innkeeper (uncredited)

Bud Geary as Cop (uncredited)

Milton Gowman as Villager in Opera (uncredited)

Herschel Graham as Villager in Opera (uncredited)

Harrison Greene as Detective (uncredited)

Julia Griffith as Opera Spectator (uncredited)