Suwa (諏訪市; -shi) is a city located in Nagano, Japan.
As of 2003, the city has an estimated population of 53,600 and the density of 491.47 persons per km². The total area is 109.06 km².
The city was founded on August 10, 1941.
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Suwa was also an old province located in Tosando of Japan for a brief period of time, which today composes the southern part of Nagano prefecture.