| Shinshūshinmachi | |
| Native Name Lang: | ja |
| Settlement Type: | Former municipality |
| Pushpin Map: | Japan |
| Pushpin Map Caption: | Location in Japan |
| Coordinates: | 36.5667°N 138°W |
| Subdivision Type: | Country |
| Subdivision Name: | Japan |
| Subdivision Type1: | Region |
| Subdivision Name1: | Chūbu |
| Subdivision Type2: | Prefecture |
| Subdivision Name2: | Nagano Prefecture |
| Subdivision Type3: | District |
| Subdivision Name3: | Kamiminochi |
| Extinct Title: | Merged |
| Extinct Date: | 1 January 2010 (now part of Nagano) |
| Leader Title: | Mayor |
| Leader Title1: | Vice Mayor |
| Unit Pref: | Metric |
| Area Total Km2: | 70.73 |
| Population Total: | 5,181 |
| Population As Of: | 1 May 2008 |
| Population Density Km2: | 73.3 |
| Timezone1: | JST |
| Utc Offset1: | +09:00 |
| Blank Name Sec1: | City hall address |
was a town located in Kamiminochi District, Nagano Prefecture, Japan.
As of 2003, the town had an estimated population of 5,762 and a density of 81.46 persons per km2. The total area was 70.73 km2.
On January 1, 2010, Shinshūshinmachi, along with the village of Nakajō (also from Kamiminochi District), was merged into the expanded city of Nagano.[1]