The Abbey of San Juan Bautista de Corias (Asturian: San Xuan Bautista de Courias) is a former Benedictine monastery in Corias on the right bank of the Narcea River, dedicated to Saint John the Baptist, in the Province of Asturias. Today it is a historic site of the province, informally known as "the Asturian Escorial" (el Escorial Asturiano), due to the burial there of King Bermudo I of Asturias (died 797) and his family.
The abbey was founded in 1022 through a donation of land by Count Piñolo Jiménez (Piniolo) and his wife Aldonza Muñoz, wealthy Leonese aristocrats. The construction of the planned monastery, built in the Romanesque style, was completed in 1043 and a monastic community was established there the following year.
The first abbot was Arias Cromaz, a relative of Piniolo and thus also of Oveco, who was Bishop of Oviedo from 913 to about 960. After 19 years as abbot, Arias was named Bishop of Oviedo by King Alfonso VI of León and Castile. Land disputes arose with the various powers of the region during its early days, and, about the turn of the 12th century, a number of agreements are recorded between Count Fernando Díaz, one of the most powerful lords of the region, and Munio, the Abbot of Corias, wherein a number of towns were swapped.
The abbey reached the peak of its power in the 12th and 13th centuries, with properties stretching across western Asturias and into the neighboring Province of León. Nonetheless, the monks were a major influence in the agricultural development of the region, as they introduced viticulture, as well as the raising of cereals and tobacco to Asturias. They also had an important influence on local methods of cattle-raising, with the establishment of pastures in the higher elevations of the land. Over the centuries, they also refined methods for more effective hunting and fishing on the abbatial lands, as well as for its management.