Abbaye Saint-Nicolas, Benedictine abbey in Verneuil-sur-Avre, France.

The Abbaye Saint-Nicolas forms a quadrilateral of light gray stone buildings attached to the church of Saint-Nicolas. The chapel has tall pointed-arch windows between buttresses, and a slate-roofed spire with a small lantern rises above a lower wing. A banner reading "Abbaye Saint-Nicolas" hangs on the pale facade to the left, and two gravel paths diverge across the former orchard.

Charlotte de Hautemer, widow of Verneuil's governor Baron Rouxel de Médavy, obtained the bishop of Évreux's consent and installed her daughter Scholastique Guyonne de Médavy with five nuns on 25 April 1627. Louis XIII raised the priory to a royal abbey in 1631, keeping the right to name abbesses; he also had Verneuil's castle demolished, enabling a second wing finished in 1635. The nuns were expelled in 1792 and returned in 1825.

The abbess's parlor preserves wall paintings of landscapes, one depicting the Château de Médavy, the family seat of the foundress Scholastique Guyonne de Médavy. The iron grille closing the parlor is still in place. A Louis XIII staircase holds a niche where a 1.25 m Renaissance-style Virgin and Child, holding an apple in her right hand, stood before the last nuns took it to Valmont.

The grounds can be accessed through a grassy area that was once an orchard, providing an open and natural approach to the site. Guided tours are available throughout the year to help visitors navigate the different sections of the compound.

From 1947 to 2001, the community operated a bakery that produced traditional French nonnette biscuits. This specialized production made the monastery known well beyond the local area.