Kuydusun (Russian: Куйдусун; Yakut: Куйдуһун, Kuyduhun) is a rural locality (a selo) in Borogonsky 2-y Rural Okrug of Oymyakonsky District in the Sakha Republic, Russia, located 567 kilometers (352 mi) from Ust-Nera, the administrative center of the district, and 3 kilometers (1.9 mi) from Tomtor, the administrative center of the rural okrug.

[1] Its population as of the 2002 Census was 139.

[1] The village is located on the left bank of the Kuydusun, a tributary of the Indigirka.

[5] There is a bridge over the river east of the village.

This Sakha Republic location article is a stub.