Kiso (木祖村, Kiso-mura) is a village located in Nagano Prefecture, Japan.

The total area of the village is 140.50 square kilometres (54.25 sq mi).

The village has a climate characterized by characterized by cool and humid summers, and cold winters with heavy snowfall (Köppen climate classification Dfb).

The average annual rainfall is 1860 mm with September as the wettest month.

[2] Per Japanese census data,[4] the population of Kiso has decreased over the past 30 years.