盐山市是日本山梨县东北部的一个已不存在的市。市域南北狭长，国道411号纵贯市域南北。

Enzan(塩山市,Enzan-shi) was a city located in Yamanashi Prefecture, Japan. The city was founded on April 5, 1954.

As of 2003, the city had an estimated population of 25,856 and the density of 139.96 persons per km². The total area was 184.74 km².

On November 1, 2005, Enzan, along with the town of Katsunuma, and the village of Yamato (both from Higashiyamanashi District), was merged to create the city of Kōshū.