Atout cœur à Tokyo pour OSS 117 (English: Trump-Card in the Heart of Tokyo for OSS 117) is a 1966 French Eurospy spy-fi film. It was the fourth OSS 117 film of the 1960s, directed by Michel Boisrond, presented by the director of the three previous 1960's OSS films, André Hunebelle and produced by Paul Cadéac. Frederick Stafford makes his second and last appearance as OSS 117.

The film was shot on Japanese locations and featured action scenes arranged by Hunebelle's stunt coordinator Claude Carliez with production design by Max Douy.

Though based on Jean Bruce's character, the film features an original story by the first James Bond director Terence Young. The film was released a year before the James Bond film You Only Live Twice and has some similarities to that film and the future James Bond film The Spy Who Loved Me as well as previous 007 films such as Thunderball.