The Byoryolyokh (Russian: Бёрёлёх, Yakut: Бөрөлөөх, romanized: Börölööx) is a river in Yakutia in Russia. It flows into the Russko-Ustyinskaya, a left distributary of the Indigirka.
The length of the Byoryolyokh is 754 kilometres. The area of its drainage basin is 17,000 square kilometres.
There are more than nine thousand lakes in the basin of the Byoryolyokh River. It usually floods over its banks in July and August. In winter it freezes to the bottom.
