Saku is a small borough in Harju County, Estonia, located about 16 kilometres (10 miles) south of Tallinn, the national capital. It serves as the administrative centre of Saku Parish.
With a population of 4,675 recorded on 1 April 2012, Saku is the third biggest small borough in Estonia. A small borough (alevik) is a type of settlement in Estonia that ranks between a village and a town.