Llanllugan Abbey was a monastery of Cistercian nuns, one of only two women's monasteries in Wales, located at Llanllugan, Powys, Wales. It was founded around 1188 on land donated by Maredudd ap Robert, Lord of Cedewain, and was founded as a dependency of the Cistercian monks at the Abbey of Strata Marcella. The former monastery church survives as the parish church of Llanllugan.