Kusatsu (草津町, Kusatsu-machi) is a town located in Gunma Prefecture, Japan. As of 1 September 2020, the town had an estimated population of 6,255 in 3407 households, and a population density of 130 persons per km2. The total area of the town is 249.75 square kilometres (96.43 sq mi). Kusatsu is one of the most famous hot springs resorts in Japan.
Kusatsu is situated about 1,200 meters above sea level. The active volcano Kusatsu-Shirane (2,160 m) and the inactive Mount Tengu (1,385 m) and Mount Motoshirane (2,171 m) are located west of Kusatsu.