The Black Room

Boris Karloff

Baron Gregor de Berghman / Anton de Berghman

Marian Marsh

Thea Hassel

Robert Allen

Lt. Albert Lussan

Thurston Hall

Col. Paul Hassel

Katherine DeMille

Mashka

John Buckler

Beran - the gypsy

Henry Kolker

Baron de Berghman

Colin Tapley

Paul Hassel as a young lieutenant

Torben Meyer

Peter, the majordomo

John George

Inn Waiter (uncredited)

John Bleifer

Franz - Captured Assassin-Villager (uncredited)

Marion Lessing

Maria the Chambermaid

George MacQuarrie

The Judge

Robert Middlemass

The Prosecutor