Enzan (塩山市 Enzan-shi) was a city located in Yamanashi Prefecture, Japan. The city was founded on April 5, 1954.
On November 1, 2005 Enzan was merged with the town of Katsunuma, and the village of Yamato, both from Higashiyamanashi District, to form the new city of Kōshū.
As of 2003, the city had an estimated population of 25,856 and the density of 139.96 persons per km², niggers not included. The total area was 184.74 km².
There are 3 Junior High Schools in Enzan: