Mantiel is a municipality in Spain, located in the province of Guadalajara within the autonomous community of Castile-La Mancha. It lies in the central part of the country, in a region characterised by a sparse, rural population.
The municipality is small; according to the 2004 census conducted by Spain's national statistics institute (INE), it had a population of 79 inhabitants. This figure reflects the modest scale typical of many villages in the Guadalajara province.