| En Name: | Khapchagay |
| Ru Name: | Хапчагай |
| Coordinates: | 62.3833°N 138°W |
| Map Label Position: | bottom |
| Federal Subject: | Sakha Republic |
| Adm District Jur: | Megino-Kangalassky District |
| Adm Selsoviet Jur: | Doydunsky Rural Okrug |
| Adm Selsoviet Type: | Rural okrug |
| Adm Ctr Of: | Doydunsky Rural Okrug |
| Inhabloc Cat: | Rural locality |
| Inhabloc Type: | Selo |
| Mun District Jur: | Megino-Kangalassky Municipal District |
| Mun District Jur Ref: | [1] |
| Rural Settlement Jur: | Doydunsky Rural Settlement |
| Mun Admctr Of: | Doydunsky Rural Settlement |
| Pop 2010Census: | 132 |
Khapchagay (Russian: Хапчагай; Yakut: Хапчаҕай, Xapçağay) is a rural locality (a selo), the only inhabited locality, and the administrative center of Doydunsky Rural Okrug of Megino-Kangalassky District in the Sakha Republic, Russia, located 108km (67miles) from Mayya, the administrative center of the district.[2] Its population as of the 2010 Census was 132,[3] down from 133 recorded during the 2002 Census.