Algadefe is a municipality in Spain, located in the province of León within the autonomous community of Castile and León. It lies in the northwestern part of the country, in a region characterised by a continental climate and a landscape of plains and low hills typical of the Leonese countryside.
The municipality is small in population: according to the 2010 census carried out by Spain's National Statistics Institute (INE), Algadefe had 315 inhabitants. Like many rural municipalities in this part of Castile and León, it is a compact settlement surrounded by agricultural land.
Its administrative status as a municipality means it forms one of the basic units of local government in Spain, with its own local council. The town is part of the wider Leonese comarca system, though the province of León serves as its primary administrative reference within the Castile and León region.