Nagano(长野市,Nagano-shi), the capital city of Nagano Prefecture, is located in the northern part of the prefecture near the confluence of the Chikuma and the Sai rivers, on the main Japanese island of Honshū.

As of April 1, 2011, the city had an estimated population of 387,146 and a population density of 460 persons per km². The total area is 834.85 km².