Boris Karloff as Imhotep, alias Ardath Bey

Zita Johann as Helen Grosvenor / Princess Anck-es-en-Amon

David Manners as Frank Whemple

Arthur Byron as Sir Joseph Whemple

Edward Van Sloan as Dr. Muller

Bramwell Fletcher as Ralph Norton

Noble Johnson as The Nubian Servant

Kathryn Byron as Frau Muller

Leonard Mudie as Professor Pearson

James Crane as The Pharaoh

Henry Victor as The Saxon Warrior (scenes deleted)

Arnold Gray as Knight (scenes deleted)

Florence Britton as Nurse (uncredited)

Jack Deery as Party Guest (uncredited)

Bill Elliott as Party Guest (uncredited)

C. Montague Shaw as Gentleman #1 at Party (uncredited)

Leyland Hodgson as Gentleman #2 at Party (uncredited)

Eddie Kane as Inspector's Assistant (uncredited)

Tony Marlow as Police Inspector (uncredited)

George Regas as Egyptian at Princess Deathbed (uncredited)

Nick Shaid as Egyptian (uncredited)

Pat Somerset as Helen's Dancing Partner (uncredited)

Arthur Tovey as Nubian (uncredited)