Barrio de Muñó 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 northern Spain, situated in the Burgos countryside.
The municipality is notable for its very small population. According to the 2004 census carried out by the Instituto Nacional de Estadística (INE), Barrio de Muñó had 32 inhabitants. This makes it one of the many sparsely populated villages characteristic of the Burgos province and the wider Castile and León region.