| En Name: | Sasyr |
| Ru Name: | Сасыр |
| Other Name: | Сааһыр |
| Other Lang: | Sakha |
| Coordinates: | 65.1664°N 147.0767°W |
| Map Label Position: | left |
| Federal Subject: | Sakha Republic |
| Adm District Jur: | Momsky District |
| Adm Selsoviet Jur: | Ulakhan-Chistaysky National Rural Okrug |
| Adm Selsoviet Type: | Rural okrug |
| Adm Ctr Of: | Ulakhan-Chistaysky National Rural Okrug |
| Inhabloc Cat: | Rural locality |
| Inhabloc Type: | Selo |
| Mun District Jur: | Momsky Municipal District |
| Mun District Jur Ref: | [1] |
| Rural Settlement Jur: | Ulakhan-Chistaysky National Rural Settlement |
| Mun Admctr Of: | Ulakhan-Chistaysky National Rural Settlement |
| Pop 2010Census: | 713 |
| Postal Codes: | 678863 |
Sasyr (Russian: Сасыр; Yakut: Сааһыр, Saahır) is a rural locality (a selo), the only inhabited locality, and the administrative center of Ulakhan-Chistaysky National Rural Okrug of Momsky District in the Sakha Republic, Russia, located 400km (200miles) from Khonuu, the administrative center of the district. Its population as of the 2010 Census was 713,[2] of whom 364 were male and 349 female, down from 772 recorded during the 2002 Census.[3]
It is the nearest village to Moma Natural Park.[4]