was a village located in Iwata District, Shizuoka Prefecture, Japan.
At the time of its merger, the village had an estimated population of 1,123 and a density of 16 persons per km<sup>2</sup>. The total area was 70.23 km<sup>2</sup>.
On July 1, 2005, Tatsuyama, along with the cities of Tenryà « and Hamakita, the town of Haruno (from Shà «chi District), the towns of Hosoe, Inasa and Mikkabi (all from Inasa District), the towns of Misakubo and Sakuma (all from Iwata District), and the towns of Maisaka and Yà «tà  (both from Hamana District), was merged into the expanded city of Hamamatsu.
Prior to the merge, Tatsuyama was the last village within Shizuoka Prefecture. It is now part of Tenryà «-ku, Hamamatsu City.