Khaptagay (Russian: Хаптагай; Yakut: Хаптаҕай, Xaptağay, lit.

flat) is a rural locality (a selo), the only inhabited locality, and the administrative center of Khaptagaysky Rural Okrug of Megino-Kangalassky District in the Sakha Republic, Russia, located 36 kilometers (22 mi) from Mayya, the administrative center of the district,[1] at the confluence of the Myla and Lena Rivers, near the mouth of the Tamma in the Lena, on the Amur–Yakutsk Mainline.

Its population as of the 2010 Census was 1,004;[2] down from 1,014 recorded in the 2002 Census.

[1] The Tamginsky Ironworks operated in this area in 1735–1756.

Nowadays, Khaptagay is an agricultural center, with the main aspects being cattle and horse breeding.