Sarah-Léonie Cysique will play at 23 and for her first Olympics the final in the under 57 kg category.
The Sarcelles judokate defeated the formidable Canadian Jessica Klimkait, the reigning world champion, in the semifinals on Monday morning.
It will be opposed a little before noon the Kosovar Nora Gjakova, European champion 2018 and third in the last Worlds.
It therefore offers a third medal for French judo, hoping for gold after Luka Mkheidze (bronze) and Amandine Buchard (silver).
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In the quarterfinals, the young Cysique had come out of a badly embarked fight against the Georgian Eteri Liparteliani, who scored the first with a waza-ari.
But the French equalized, before scoring again waza-ari in the Golden Score to reach the semi-final.
Previously, the Frenchwoman started her tournament with a victory by waza-ari against the young South Korean Jisu Kim, recent vice-champion of Asia.