Barbadillo del Pez is a municipality and town in the province of Burgos, within the autonomous community of Castile and León, Spain. It is a small rural settlement in the northern part of the country.
The municipality had a population of 82 inhabitants according to the 2007 census conducted by the Instituto Nacional de Estadística (INE). This figure reflects the modest size typical of many villages in the sparsely populated Burgos countryside.