The Ribera del Duero is a comarca or district located at the southern tip of the province of Burgos, part of the Spanish autonomous community of Castile and León. The capital of the Ribera del Duero comarca or district is the town of Aranda de Duero.

In Spain, a comarca is either a traditional territorial division without any formal basis, or a group of municipalities, legally defined by an autonomous community for the purpose of providing common local government services. In English, a comarca is equivalent to a district, county, area or zone.