Les Feuillants Abbey, also Feuillant Abbey (French: Abbaye des Feuillants, Abbaye des Feuillans or de Feuillant, also Abbaye Notre-Dame-des-Feuillants, des Feuillans or de Feuillant; Latin: Fulium), was a Cistercian monastery located in the present commune of Labastide-Clermont, about 8 kilometres south of Rieumes, department of Haute-Garonne, France.
From the 16th century it was the centre of the Cistercian reform movement to which it gave its name, the Feuillants.
In 1169 (or possibly 1163) the new foundation joined the Cistercian movement as a daughter house of La Crête Abbey of the filiation of Morimond.
From 1577 the ascetic reforms introduced by the commendatory abbot Jean de la Barrière were practised here, and were so widely taken up in other monasteries that in 1589 the abbey became the head of the Feuillants as an independent order, which separated from the Cistercian Order.
It was dissolved, along with the order of which it was the mother house, in 1791, during the French Revolution.