Nishiazai (西浅井町 Nishiazai-chō) was a town located in Ika District, Shiga, Japan.
As of 2003, the town had an estimated population of 4,735 and a density of 70.62 persons per km². The total area was 67.05 km².
On January 1, 2010, several municipalities were merged into the city of Nagahama. Kohoku and Torahime in Higashiazai District and Kinomoto, Nishiazai, Takatsuki, and Yogo in Ika District and merged into Nagahama. Higashiazai District and Ika District were both dissolved.[1]