The Khatyngnakh (Russian: Хатынгнах; Yakut: Хатыҥнаах, Xatıŋnaax), or Khatynnakh (Хатыннах), is a river in the Sakha Republic (Yakutia), Russia.

It flows north of the Arctic Circle, across desolate territories of the Aby District.

It is formed by the confluence of the 156 km (97 mi) long Donskaya from the left and the 115 km (71 mi) long 2nd Nonchondzhya (2-я Нонгонджя) from the right, both rivers having their sources in the southern slopes of the Polousny Range.

The Khatyngnakh flows meandering roughly southwards across a vast floodplain in the northern sector of the Aby Lowland, where there are innumerable lakes and swamps.

Finally the river joins the left bank of the Uyandina 170 km (110 mi) from its mouth in the Indigirka.