| En Name: | Tasagar |
| Ru Name: | Тасагар |
| Other Name: | Тааһаҕар |
| Other Lang: | Sakha |
| Coordinates: | 63.7669°N 122.6783°W |
| Map Label Position: | left |
| Federal Subject: | Sakha Republic |
| Adm District Jur: | Vilyuysky District |
| Adm Selsoviet Jur: | Tasagarsky Rural Okrug |
| Adm Selsoviet Type: | Rural okrug |
| Adm Ctr Of: | Tasagarsky Rural Okrug |
| Inhabloc Cat: | Rural locality |
| Inhabloc Type: | Selo |
| Mun District Jur: | Vilyuysky Municipal District |
| Mun District Jur Ref: | [1] |
| Rural Settlement Jur: | Tasagarsky Rural Settlement |
| Mun Admctr Of: | Tasagarsky Rural Settlement |
| Pop 2010Census: | 544 |
Tasagar (Russian: Тасагар; Yakut: Тааһаҕар, Taahağar) is a rural locality (a selo), the only inhabited locality, and the administrative center of Tasagarsky Rural Okrug of Vilyuysky District in the Sakha Republic, Russia, located 57km (35miles) from Vilyuysk, the administrative center of the district. Its population as of the 2010 Census was 544,[2] of whom 277 were male and 267 female, down from 571 as recorded during the 2002 Census.[3]