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)