Valbuena de Duero is a municipality located in the province of Valladolid, Castile and León, Spain.

San Bernardo is a village within Valbuena de Duero municipality.

Its inhabitants came from Santa María de Poyos, a town in Guadalajara Province that was submerged by the waters of the Embalse de Buendía reservoir.

Presently there is a Ribera del Duero DO wine cellar in San Bernardo named after the village.

This article about a location in the province of Valladolid, Spain is a stub.