Cantalojas is a municipality in the province of Guadalajara, within the autonomous community of Castile-La Mancha, Spain. It is a small rural settlement in the sparsely populated highlands of the province, north-east of the city of Guadalajara.
The municipality is notable for its very small population. According to the 2004 census (INE), Cantalojas had 144 inhabitants, reflecting the low population density typical of this part of inland Spain.
Its principal heritage landmark is the Church of San Pedro Apóstol, which was declared a Bien de Interés Cultural in 1965, recognising it as part of Spain's protected cultural heritage.