The Man in Half Moon Street

Nils Asther

Dr. Julian Karell

Helen Walker

Eve Brandon

Reinhold Schünzel

Dr. Kurt van Bruecken

Paul Cavanagh

Dr. Henry Latimer

Konstantin Shayne

Dr. B.A. Vishanoff

Leyland Hodgson

Dr. G.B. Albertson

Edmund Breon

Sir Humphrey Brandon

Morton Lowry

Alan Guthrie

Matthew Boulton

Detective Inspector Ned Garth

Eustace Wyatt

Inspector Lawson

Brandon Hurst

Simpson

Arthur Mulliner

Sir John Aldergate

Aminta Dyne

Lady Minerva Aldergate

Edward Fielding

Colonel Ashley

Forrester Harvey

Harris

Ernie Adams

Porter

Norman Ainsley

Butler in Brandon's Home

Donald Gallaher

Ticket Agent

John Sheehan

Expressman

Edward Cooper

Liveried Servant