Mondéjar is a municipality in the province of Guadalajara, in the autonomous community of Castile-La Mancha, Spain. It lies in the central part of the country, within the historic region of Castile.
According to the 2008 census conducted by Spain's National Statistics Institute (INE), the municipality had a population of 2,900 inhabitants. This figure reflects its status as a small Spanish municipality rather than a large urban centre.
Mondéjar is administratively part of the province of Guadalajara, whose capital is the city of Guadalajara. As a municipality, it forms one of the basic units of local government in Spain.