Treis-Sants-en-Ouche is a commune in the Eure department in Normandy in northern France.

It was established on 1 January 2019 by merger of the former communes of Saint-Aubin-le-Vertueux (the seat), Saint-Clair-d'Arcey and Saint-Quentin-des-Isles.

[2] The commune along with another 69 communes shares part of a 4,747 hectare, Natura 2000 conservation area, called Risle, Guiel, Charentonne.

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