Monasterio is a municipality in Spain, located in the province of Guadalajara within the autonomous community of Castile-La Mancha.
It is a very small settlement: according to the 2004 census carried out by the Instituto Nacional de Estadística (INE), the municipality had a population of 24 inhabitants. This makes it one of the many sparsely populated rural municipalities characteristic of the Guadalajara province.
Beyond its administrative status as a municipality and its recorded population figure, no further details about the town are available in the source material.