Ōtsu is the capital city of Shiga Prefecture, located in Japan. It serves as a primary administrative center for the region.
As of October 1, 2021, the city had an estimated population of 343,991 residents living in 153,458 households. The area covers a total of 464.51 square kilometres (179.35 sq mi), resulting in a population density of 740 persons per square kilometre.