Coordinates: 48°44′39″N 2°0′58″E / 48.74417°N 2.01611°E
Port-Royal-des-Champs was an abbey of Cistercian nuns in Magny-les-Hameaux, in the Vallée de Chevreuse southwest of Paris that launched a number of culturally important institutions.
The abbey was established in 1204, but became famous when its discipline was reformed in 1609 by its abbess, Mother Marie Angelique Arnauld (1591-1661). The Arnauld family became its patrons and the abbey's subsequent history was directed by a number of the members of that family. In 1625 most of the nuns moved to a new Port-Royal in Paris, which subsequently became Port-Royal de Paris (or, more commonly, Port-Royal) while the older one was known as Port-Royal des Champs ("Port-Royal of the fields").
At the original site, several schools were founded, which became known as the "Little Schools of Port-Royal" (Les Petites-Ecoles de Port-Royal). These schools became famous for the high quality of the education they gave. Playwright Jean Racine was a product of Port-Royal education. In 1634 Jean du Vergier de Hauranne, Abbé de Saint-Cyran, became spiritual director of the abbey; he was a companion of Jansenius and the implementer of Jansenism in France. From that point forward, the abbeys and schools of Port-Royal became intimately associated with that school of theology.