Tatomi, Yamanashi

 was a town located in Nakakoma District, Yamanashi Prefecture, Japan.
As of 2003, the town had an estimated population of 16,934 and a population density of 1,678.30 persons per km². The total area was 10.09 km².
On February 20, 2006, Tatomi, along with the town of Tamaho (also from Nakakoma District), and the village of Toyotomi (from Higashiyatsushiro District), was merged to create the city of Chūō.