Erin-ji (恵林寺), is a Buddhist temple belonging to the Myōshin-ji branch of the Rinzai school of Japanese Zen. Located in the city of Kōshū, Yamanashi, Japan. It is the clan temple of the Takeda clan, noted Sengoku period warlords and rulers of Kai Province from the Muromachi period. Its main image is a statue of Shaka Nyōrai.

Kōshū is a city located in Yamanashi Prefecture, Japan. As of 1 September 2020, the city had an estimated population of 29,659 in 13,141 households, and a population density of 120 persons per km². The total area of the city is 264.11 square kilometres (101.97 sq mi). The city is the home of the indigenous Koshu grape and is synonymous with viticulture and wine production in Japan.