| En Name: | Usun |
| Ru Name: | Усун |
| Other Name: | Уһун |
| Other Lang: | Sakha |
| Coordinates: | 64.5167°N 124°W |
| Map Label Position: | right |
| Federal Subject: | Sakha Republic |
| Adm District Jur: | Vilyuysky District |
| Adm Selsoviet Jur: | Kyuletsky 1-y Rural Okrug |
| Adm Selsoviet Type: | Rural okrug |
| Adm Ctr Of: | Kyuletsky 1-y Rural Okrug |
| Inhabloc Cat: | Rural locality |
| Inhabloc Type: | Selo |
| Mun District Jur: | Vilyuysky Municipal District |
| Mun District Jur Ref: | [1] |
| Rural Settlement Jur: | Kyuletsky 1-y Rural Settlement |
| Mun Admctr Of: | Kyuletsky 1-y Rural Settlement |
| Pop 2010Census: | 1051 |
| Postal Codes: | 678222 |
Usun (Russian: Усун; Yakut: Уһун, Uhun) is a rural locality (a selo), the only inhabited locality, and the administrative center of Kyuletsky 1-y Rural Okrug (pronounced as /ru/) in Vilyuysky District of the Sakha Republic, Russia, located 140km (90miles) from Vilyuysk, the administrative center of the district. Its population as of the 2010 Census was 801,[2] up from 743 recorded during the 2002 Census.[3]
It has a high school, agricultural enterprise, kindergarten, shop, communication center, district hospital, bank.