Tōbu (東部町 Tobu-machi?) was a town located in Chiisagata District, Nagano Prefecture, Japan.
As of March 1, 2004, the town had an estimated population of 26,392 and a density of 304.93 persons per km². The total area was 86.55 km².
On April 1, 2004, Tōbu, along with the village of Kitamimaki (from Kitasaku District), was merged to create the city of Tōmi.