Lomtuka (; , Loomtuka) is a rural locality (a selo), the only inhabited locality, and the administrative center of Tyllyminsky 1-y Rural Okrug of Megino-Kangalassky District in the Sakha Republic, Russia, located from Mayya, the administrative center of the district. Its population as of the 2010 Census was 701, down from 798 recorded during the 2002 Census.