Tat-Kuchuk (; , Tat-Kösök) is a rural locality (a village) in Dyurtyulinsky Selsoviet, Sharansky District, Bashkortostan, Russia. The population was 100 as of 2010. There is 1 street.
Tat-Kuchuk is located 13 km southwest of Sharan (the district's administrative centre) by road. Sarsaz is the nearest rural locality.