Antigüedad is a municipality in the province of Palencia, in the autonomous community of Castile and León, Spain. It lies in the northern part of the country, within the broad plateau region that characterises much of Castile and León.
The municipality is small in population: according to the 2004 census carried out by Spain's National Statistics Institute (INE), it had 405 inhabitants. Like many rural municipalities in this part of Spain, it is a compact settlement surrounded by open countryside.
Antigüedad is one of numerous small municipalities that make up the province of Palencia, a largely rural province whose administrative centre is the city of Palencia. The municipality's official name is rendered in Spanish as Antigüedad.