Hontoba 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 the Alcarria.
The municipality is small and rural in character. According to the 2008 census carried out by Spain's National Statistics Institute (INE), Hontoba had a population of 336 inhabitants.
Like other settlements in the province of Guadalajara, Hontoba forms part of the sparsely populated countryside of inland Castile-La Mancha, where municipalities of a few hundred residents are common.