Blackmail

Anny Ondra

Alice White

Sara Allgood

Mrs. White

Charles Paton

Mr. White

John Longden

Detective Frank Webber

Donald Calthrop

Tracy

Cyril Ritchard

The Artist

Hannah Jones

The Landlady

Harvey Braban

The Chief Inspector

?

Ex-Det. Sergt. Bishop

The Detective Sergeant

Alfred Hitchcock

Man on Subway (uncredited)

?

Johnny Ashby

Boy (uncredited)

Joan Barry

Alice White (voice) (uncredited)

?

Johnny Butt

Sergeant (uncredited)

Phyllis Konstam

Gossiping Neighbour (uncredited)

?

Sam Livesey

The Chief Inspector (silent version) (uncredited)