Monasterio de Santa María de Villanueva de Oscos is a monastery in Asturias, Spain.^[1] It was founded in the 12th century as a Benedictine house.

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The monastic community was closed by the ecclesiastical confiscations of Mendizábal. The church has remained in use as a parish church.

The cartulary preserves 616 parchments about the Middle Ages: 32 from the 12th century, 261 from the 13th century, 224 from the 14th century and 99 from the 15th century.^[2]