Achi (阿智村, Achi-mura) is a village located in Nagano Prefecture, Japan.

The total area of the village is 214.43 square kilometres (82.79 sq mi).

Mount Ena (2191 meters) is on the border of the village with Gifu Prefecture.

[3] Per Japanese census data,[5] the population of Achi has decreased over the past 70 years.

The village has one public high school, which is operated by the Nagano Prefectural Board of Education.