| Tomiyama | |
| Native Name Lang: | ja |
| Settlement Type: | Former municipality |
| Pushpin Map: | Japan |
| Pushpin Map Caption: | Location in Japan |
| Coordinates: | 35.235°N 137.1851°W |
| Subdivision Type: | Country |
| Subdivision Name: | Japan |
| Subdivision Type1: | Region |
| Subdivision Name1: | Chūbu (Tōkai) |
| Subdivision Type2: | Prefecture |
| Subdivision Name2: | Aichi Prefecture |
| Subdivision Type3: | District |
| Subdivision Name3: | Kitashitara |
| Extinct Title: | Merged |
| Extinct Date: | October 1, 2005 (now part of Toyone) |
| Leader Title: | Mayor |
| Leader Title1: | Vice Mayor |
| Unit Pref: | Metric |
| Area Total Km2: | 34.78 |
| Population Total: | 218 |
| Population As Of: | November 27, 2005 |
| Population Density Km2: | 6.3 |
| Timezone1: | JST |
| Utc Offset1: | +09:00 |
| Blank Name Sec1: | City hall address |
was a village located in Kitashitara District, Aichi Prefecture, Japan.
As of May 1, 2004, the village had an estimated population of 218 and a density of 6.3 persons per km2. Its total area was 34.78 km2.
Tomiyama was located at the extreme northeast corner of Aichi Prefecture, in an area of 1000-meter mountains. Some 90 percent of the village area was covered in mountains and forest.
Tomiyama Village was created in the early Meiji period cadastral reform of 1876. The completion of the Sakuma Dam in 1955 flooded much of the arable land in the village, forcing the resettlement of most of the inhabitants, and leaving Tomiyama with the distinction of being the least populous village in Japan (aside from some isolated islets).
On November 27, 2005, Tomiyama was merged into expanded the village of Toyone and has ceased to exist as an independent municipality.