Greta Garbo

as Mata Hari

Ramon Novarro

as Lt. Alexis Rosanoff

Lionel Barrymore

as General Serge Shubin

Lewis Stone

as Andriani

C. Henry Gordon

as Dubois

Karen Morley

as Carlotta

Alec B. Francis

as Major Caron

Blanche Friderici

as Sister Angelica

Edmund Breese

as Warden

Helen Jerome Eddy

as Sister Genevieve

Frank Reicher

as The Cook - Spy

Mischa Auer

as Firing Squad Victim (uncredited)

Reginald Barlow

as Prosecutor (uncredited)

Harry Cording

as Ivan (uncredited)

Cecil Cunningham

as Gambler Selling Ring (uncredited)

Maude Turner Gordon

as Madame Durand (uncredited)

Sarah Padden

as Sister Teresa (uncredited)

Michael Visaroff

as Jacques (uncredited)