Basardilla is a municipality in the province of Segovia, within the autonomous community of Castile and León, Spain. It lies between the towns of Torrecaballeros and Brieva, at an altitude of 1,010 metres.
The town's name is of Roman origin and is said to mean "Zarza Valley". According to the 2004 census (INE), the municipality had a population of 149 inhabitants.