Kiso District, Nagano

Kiso District (木曽郡, Kiso-gun^?) is a district located in Nagano Prefecture, Japan.

As of November 1, 2005, the district has an estimated population of 34,759. The total area is 1,546.26 km².

Historically, the district was once known as Nishichikuma District (西筑摩郡) until May 1, 1968.

There are only 3 Towns and 3 villages within the district.