Saku (German: Sack) is a small town (Estonian: alevik) in Harju County, Estonia, located 16 km (10 mi) south from Tallinn, the capital. It is the administrative centre of Saku Parish. Saku had a population of 4,675 on 1 April 2012, which makes it the biggest small town in Estonia.
Saku is most known by Saku Brewery which is one of two biggest breweries in Estonia.
Saku has a station on the Edelaraudtee's western route.
Vääna River crosses Saku.
Saku Manor (German: Sack) traces its history back to 1463. The current manor house was built in 1825-1830 in a neoclassical style, and is possibly designed by the renowned St. Petersburg architect Carlo Rossi. It is one of the finest examples, perhaps the finest, of a neoclassical manor house in Estonia.
- Evelin Ilves (born 1968), First Lady of Estonia, grew up in Saku.
- Juss Laansoo (born 1983), motocross rider
- Grit Šadeiko (born 1989), heptathlete, was born in Saku.
- Jaak Urmet (pseudonym Wimberg; born 1979), writer, was born in Saku.
- "Üldinfo" (in Estonian). Saku vald. Retrieved 27 September 2012.
- Viirand, Tiiu (2004). Estonia. Cultural Tourism. Kunst Publishers. p. 55. ISBN 9949-407-18-4.
- Sakk, Ivar (2004). Estonian Manors - A Travelogue. Tallinn: Sakk & Sakk OÜ. pp. 44–45. ISBN 9949-10-117-4.
- Hein, Ants (2009). Eesti Mõisad - Herrenhäuser in Estland - Estonian Manor Houses. Tallinn: Tänapäev. p. 31. ISBN 978-9985-62-765-5.