Mata Hari, agent H21
- Taon: 1964
- Bansa: France, Italy
- Genre: Drama, History, Romance, War
- Studio: Fida Cinematografica, Filmel, Les Films du Carrosse, Simar Films
- Keyword: world war i, secret agent, based on true story, romance, femme fatale, execution, secret service, exotic dancer
- Direktor: Jean-Louis Richard
- Cast: Jeanne Moreau, Jean-Louis Trintignant, Claude Rich, Henri Garcin, Georges Riquier, Frank Villard