Algar de Mesa is a municipality in Spain, located in the province of Guadalajara within the autonomous community of Castile-La Mancha. It lies in the eastern part of the country, in a region characterised by a sparse, rural population.
The municipality is small, with a population recorded as 75 inhabitants in the 2004 census carried out by Spain's National Statistics Institute (INE). This figure reflects the modest scale of the settlement and its surrounding area.
As a municipality, Algar de Mesa forms part of the local administrative structure of the province of Guadalajara, with the town serving as the seat of its municipal government.