Centenera 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 the region historically known as Castile.
The municipality is small, with a population recorded as 88 inhabitants in the 2004 census conducted by Spain's National Statistics Institute (INE). Like many settlements in rural Guadalajara province, it is a minor administrative unit rather than a large urban centre.
Centenera's chief distinguishing feature is simply its status as one of the many sparsely populated municipalities that make up the Guadalajara countryside. The available records identify it primarily by its administrative classification and its very small population.