was a town located in Nasu District, Tochigi Prefecture, Japan.
As of 2003, the town had an estimated population of 45,251 and a density of 758.86 persons per km2. The total area was 59.63 km2.
On January 1, 2005, Nishinasuno, along with the city of Kuroiso, and the town of Shiobara (also from Nasu District), was merged to create the city of Nasushiobara.
It is located near Mount Nasu. Some of the tourist attractions close to it are hot springs, Karasuka Mori park, and Nasu Nagahara park.