| En Name: | Kuydusun |
| Ru Name: | Куйдусун |
| Coordinates: | 63.2667°N 159°W |
| Map Label Position: | left |
| Federal Subject: | Sakha Republic |
| Adm District Jur: | Oymyakonsky District |
| Adm Selsoviet Jur: | Borogonsky 2-y Rural Okrug |
| Adm Selsoviet Type: | Rural okrug |
| Inhabloc Cat: | Rural locality |
| Inhabloc Type: | Selo |
| Mun District Jur: | Oymyakonsky Municipal District |
| Mun District Jur Ref: | [1] |
| Rural Settlement Jur: | Borogonsky 2-y Rural Settlement |
| Pop 2002Census: | 139 |
Kuydusun (ru|Куйдусун; sah|Куйдуһун, Kuyduhun) is a rural locality (a selo) in Borogonsky 2-y Rural Okrug of Oymyakonsky District in the Sakha Republic, Russia, located 567km (352miles) from Ust-Nera, the administrative center of the district, and 3km (02miles) from Tomtor, the administrative center of the rural okrug.[2] Its population as of the 2002 Census was 139.
The village is located on the left bank of the Kuydusun, a tributary of the Indigirka.[3] There is a bridge over the river east of the village.[4] [5]