南木曾町（日语：南木曽町／なぎそまち）是位于长野县西南部木曾郡的一町。

Nagiso(南木曽町,Nagiso-machi) is a town located in Kiso District, Nagano Prefecture, Japan.

As of 2003, the town has an estimated population of 5,458 and a density of 25.27 persons per km². The total area is 215.96 km (83.38 sq mi).

Nagiso is a local railway station on the Chūō Main Line, and is the nearest rail access to the restored Meiji-era town of Tsumago, Nagano Prefecture.