Grace Dieu Abbey was a small Cistercian abbey established in 1226 near to the town of Monmouth in south east Wales. No remains of its buildings can now be seen above ground. It was originally located on the west bank of the River Trothy, in remote countryside about 2 miles (3.2 km) north of the village of Dingestow, but relocated on at least one occasion after being attacked by the Welsh. Its final site is uncertain, but investigations have focused on a field on the east side of the Trothy, at grid reference SO45121311, and this is the location labeled on OS maps.