| Oguni | |
| Native Name Lang: | ja |
| Settlement Type: | Former municipality |
| Pushpin Map Caption: | Location in Japan |
| Subdivision Type: | Country |
| Subdivision Name: | Japan |
| Subdivision Type1: | Region |
| Subdivision Name1: | Hokuriku |
| Subdivision Type2: | Prefecture |
| Subdivision Name2: | Niigata Prefecture |
| Subdivision Type3: | District |
| Extinct Title: | Merged |
| Extinct Date: | April 1, 2005 (now part of Nagaoka) |
| Leader Title: | Mayor |
| Leader Title1: | Vice Mayor |
| Unit Pref: | Metric |
| Area Total Km2: | 86.15 |
| Population Total: | 7,044 |
| Population As Of: | 2003 |
| Timezone1: | JST |
| Utc Offset1: | +09:00 |
| Blank Name Sec1: | City hall address |
was a town located in Kariwa District, Niigata Prefecture, Japan.
As of 2003, the town had an estimated population of 7,044 and a density of 81.76 persons per km2. The total area was 86.15 km2.
On April 1, 2005, Oguni, along with the village of Yamakoshi (from Koshi District), the town of Nakanoshima (from Minamikanbara District), and the towns of Koshiji and Mishima (both from Santō District), was merged into the expanded city of Nagaoka.[1] [2]