Tomtor (; ) is a rural locality (a selo), the administrative centre of, and one of four settlements in addition to Aeroport, Agayakan and Kuydusun in of Oymyakonsky District in the Sakha Republic, Russia. It is located from Ust-Nera, the administrative center of the district. Its population as of the 2002 census was 1,256.
Tomtor is located near the left bank of the Kuydusun river, not far from its mouth in the Indigirka.
Tomtor has a monsoon-influenced extreme subarctic climate (Dwd in the Köppen climate classification).
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