Warner Oland

Character: Charlie Chan

Boris Karloff

Character: Gravelle

Keye Luke

Character: Lee Chan

William Demarest

Character: Sergeant Kelly

Guy Usher

Character: Inspector Regan

Margaret Irving

Character: Mme. Lilli Rochelle

Gregory Gaye

Character: Enrico Borelli

Nedda Harrigan

Character: Mme. Lucretia Borelli

Frank Conroy

Character: Mr. Whitely

Charlotte Henry

Character: Mlle. Kitty

Thomas Beck

Character: Phil Childers

Maurice Cass

Character: Mr. Arnold

Tom McGuire

Character: Pop Morris - Stage Doorman

Marc Lawrence

Character: Undetermined Minor Role (uncredited) (unconfirmed)

Joan Woodbury

Character: Dancer in Opera (uncredited)

William Bailey

Character: Detective (uncredited)

Charles Bancroft

Character: Soldier in Opera (uncredited)

John Bleifer

Character: Murdered Orderly (uncredited)

Stanley Blystone

Character: Backstage Cop Who Shoots Gravelle (uncredited)

Myrta Bonillas

Character: Villager in Opera (uncredited)

Raymond Brown

Character: Guard (uncredited)

Carita Crawford

Character: Dancer in Opera (uncredited)

Patrick Cunning

Character: Villager in Opera (uncredited)

Zari Elmassian

Character: Mme. Rochelle (singing voice) (uncredited)

Frank Fanning

Character: Cop (uncredited)

Jim Farley

Character: Detective (uncredited)

Adolph Faylauer

Character: Opera Spectator (uncredited)

Larry Fisher

Character: Cop (uncredited)

Benson Fong

Character: Opera Supernumerary (uncredited)

J. C. Fowler

Character: Opera Spectator (uncredited)

Otto Fries

Character: Innkeeper (uncredited)

Bud Geary

Character: Cop (uncredited)

Milton Gowman

Character: Villager in Opera (uncredited)

Herschel Graham

Character: Villager in Opera (uncredited)

Harrison Greene

Character: Detective (uncredited)

Julia Griffith

Character: Opera Spectator (uncredited)