Abbaye de la Valroy, Cistercian abbey in Saint-Quentin-le-Petit, France.

Abbaye de la Valroy is a former Cistercian abbey in the Barres valley between Saint-Quentin-le-Petit and Sévigny, about 41 km north of Reims. Nothing of the monastery stands; only its ground plan was uncovered after the First World War, and a few spolia are kept at La Bouverie. The visible masonry is a cylindrical tower of light grey and pale tan blocks with a broken top, a small rectangular window and a larger irregular opening edged with projecting stones.

The abbey was founded in 1147 by monks from Notre-Dame d'Igny and underwent major reconstruction in 1423. It remained active until its closure during the French Revolution at the end of the 1700s.

The abbey's Latin name, Vallis Regis (Val-le-Roi, "King's Valley"), echoes its royal patronage: Hugues I de Roucy and his wife Richildis of Hohenstaufen, a daughter of Emperor Frederick I, founded it in 1147. The monks came from Igny and belonged to the Clairvaux filiation. The abbey held farms at La Grange-aux-Bois in Sévigny, Montigny in Nizy, La Croix in Le Thour, Écoret in Chivres, Les Mortiers in Wagnon and Herbay in Signy-le-Petit.

The former abbey lies in the Barres valley between Saint-Quentin-le-Petit and Sévigny, about 26 km northwest of Rethel and 41 km north of Reims, near the hamlet of La Bouverie. Nothing of the monastery stands; the layout was traced only after World War I, so look for foundation traces in the ground rather than buildings. Spolia from the abbey are kept in La Bouverie.

World War I bombing damage exposed the original medieval foundations beneath the later structures. This accidental discovery gave researchers unexpected access to details about the earliest building techniques and layout.