Abbaye d'Entremont, Medieval abbey in Glières-Val-de-Borne, France.

Abbaye d'Entremont is a former abbey of Augustinian canons on the left bank of the Borne valley. Its church has pale plastered walls, a steep dark grey shingled roof and a projecting pinkish-orange facade with a tall arched opening and a small gabled porch. A pale grey square tower with a dark pyramidal roof and a round-arched louvered opening stands to its right, and a low stone wall runs along the base.

Canons from the abbey of Abondance settled in the valley around 1115 and founded a priory under prior Burcard. A charter of 12 February 1154 erected it as an abbey under the Rule of Saint Augustine, with Girold as first abbot and twelve canons in residence. In 1225 Count William II of Geneva made the abbey a lordship, and its abbot took the title lord of Entremont.

The abbey church also served the parish, as a pastoral visit of 1445 records that the parish church stood within the monastery itself. The canons ran a hospital from 1175 to 1250, open to the poor, the sick and travellers, where care rested on prayer and on medicinal plants gathered in the mountains or grown in the abbey gardens.

The abbey stands on the left bank of the Borne valley, along the CD 12 road between Saint-Pierre-en-Faucigny and Saint-Jean-de-Sixt, near the old Faucigny–Geneva border marked by the torrent. The site lies in the commune of Glières-Val-de-Borne, Haute-Savoie. The church also served the parish, as a pastoral visit of 1445 records.

The abbey was raised to a seigneurie in 1225 by Count Guillaume II of Geneva, after which its abbot bore the title seigneur d'Entremont. Its lands then covered 1,835 hectares, with patronage over six parishes including Amancy, Pers and Poisy, plus mills at Cran and vineyards near Saint-Sigismond.