Nathalie, Secret Agent (French: Nathalie, agent secret US: Atomic Agent) is a 1959 French-Italian comedy thriller film directed by Henri Decoin and starring Martine Carol, Félix Marten and Darío Moreno.

The film's sets were designed by the art director Robert Clavel.

After her friend falls in love with an engineer, Parisian model Nathalie attends a demonstration at the top secret factory at which he works.

She is then arrested by the security services who believe she is working as a spy for a foreign power.

Escaping she enlists the help of a friendly police officer and sets out to trap the real spies.