Abbaye de Clausonne, Medieval abbey ruins in Le Saix, France

Clausonne Abbey is a ruined stone complex on a grassy slope at Le Saix, Hautes-Alpes. Its light grey squared stone walls survive at foundation and lower-storey height, with a large rectangular doorway and a smaller square niche above it. A long metal roof on posts shelters the choir, covered in 2012 to protect the stone from frost.

Founded in 1185 as a daughter house of Notre-Dame de Lure, Clausonne followed the Chalais Order and the Rule of Saint Benedict. In 1573 Montbrun, lieutenant of Lesdiguières, partially destroyed the abbey; in 1692 troops of the Duke of Savoy burned the remains and the archives. Sold as a national asset in 1790, the buildings were partly turned into a farm, and the ruins were listed as monuments historiques in 1995.

On the north facade, facing the cloister, the round-arched "porte des convers" led the lay brothers into the nave; to its left, a pointed-arch armarium served as the book cupboard. On the north transept's west wall, the jambs of the "porte des Moines" mark the monks' entrance to the choir.

The ruins stand on a grassy slope above Le Saix, in the Hautes-Alpes. The site was bought by the Office national des forêts in 1949 for forest planting, and the hamlet's houses were demolished after the inhabitants left. The north wall was consolidated in 1998 and the choir covered in 2012.

The north wall was consolidated in 1998 by a heritage firm, and in 2012 the choir received a roof to protect its stone from frost. A survey of the building was carried out by the DRAC after the ruins were cleared, starting in 1994, when a general asked the 4th Chasseurs regiment of Gap to remove the "pile of stones".