Tatsuno (辰野町, Tatsuno-machi) is a town located in Nagano Prefecture, Japan.

Tatsuno is located in the Ina Valley of south-central Nagano Prefecture, bordered by the Kiso Mountains.

The Tenryū River flows through the town, which is surrounded by mountains and is rich in a natural environment.

The neighboring village of Asahi was annexed on April 1, 1955, followed by Kawashima on September 30, 1956, and Ono on March 31, 1961.

Per Japanese census data,[4] the population of Tatsuno has declined slightly in recent decades.