Gilgil, Kenya, is a town in the Rift Valley Province of Kenya. The town is located between Naivasha and Nakuru and along the Nairobi - Nakuru highway. It is to the west of the Gilgil River, which flows south to feed Lake Naivasha. Gilgil has a population of 18,805 according to the 1999 census. Gilgil is the centre of the Gilgil Division in Nakuru District.
During the 1920s - 1940s, some members of the Happy Valley set lived in Gilgil. In the 1940s it also contained a British internment camp for Irgun and Lehi members.
Agriculture is the main local industry while Gilgil Telecommunications Industries was a notable employer but is now closed down as it was sold by the government. There are a few industries within the outskirts of the town, namely the Gilgil Diatomite Industries which is located further to the west along the Gilgil-Nakuru main road. The industry mines diatomite which is used for various industrial purposes. The other industry is the Ndume Farm Machineries, which manufactures farm equipment;the industry is known for its maize milling machines and ploughs.
A main employer in the town remains the Ministry of Defense as the town hosts two major barracks, the Gilgil barracks located about 1 km from the Gilgil town center on the old Gilgil - Nakuru road and the Kenyatta Barracks which is also located about 2 km along the main Gilgil-Nyahururu road. The latter barracks is also known as Westcom or Western Command.