Kusatsu (草津市, Kusatsu-shi) is a city located in Shiga Prefecture, Japan. As of 1 August 2021, the city had an estimated population of 137,266 in 61426 households and a population density of 2000 persons per km². The total area of the city is 67.82 square kilometres (26.19 sq mi). The city is often confused with Kusatsu, Gunma Prefecture, which is a famous hot spring resort.