Mata Hari, agent H21
- År: 1964
- Land: France, Italy
- Genre: Drama, Historisk, Romantik, Krig
- Studio: Fida Cinematografica, Filmel, Les Films du Carrosse, Simar Films
- Nyckelord: world war i, secret agent, based on true story, romance, femme fatale, execution, secret service, exotic dancer
- Direktör: Jean-Louis Richard
- Kasta: Jeanne Moreau, Jean-Louis Trintignant, Claude Rich, Henri Garcin, Georges Riquier, Frank Villard