Adalia is a village and municipality in the province of Valladolid, in the autonomous community of Castile and León in central Spain. It is a small rural settlement rather than a city, located within the broad, sparsely populated countryside of the region.
The municipality covers an area of 16.19 square kilometres (6.25 square miles). As of 2011, it had a population of 58 people, reflecting the very low population density typical of many villages in this part of Spain.