Rueda Abbey or Rueda de Ebro Abbey (Spanish: Real Monasterio de Nuestra Señora de Rueda, or the "Royal Monastery of Our Lady of the Wheel") is a former Cistercian monastery in Sástago in the Ribera Baja del Ebro comarca, province of Zaragoza, Aragon, Spain, 74 kilometres to the south-east of Zaragoza on the left bank of the Ebro.