Santa María de Sandoval was a Roman Catholic monastery of the Cistercian Order in Spain from the 12th century until 1835.

Monastic life began at Sandoval in 1171 with twelve monks from La Santa Espina under Abbot Diego.

Although Sandoval began as a daughter house of La Santa Espina, in a short time it would equal its spiritual parent in importance.

Among Sandoval's early patrons was Urraca, daughter of Alfonso VII, whose anniversary mass was celebrated there on 25 June.

After 1487, Sandoval became part of the Congregation of Castile, a group of reformed Spanish Cistercian houses founded by Martín de Vargas.