The Biryuk (Russian: Бирюк; Yakut: Бүүрүк, Büürük) is a river in Yakutia (Sakha Republic), Russia.

Biryuk village is located by its left bank, close to its confluence with the Lena 52 kilometres (32 mi) from Olyokminsk.

The river heads in a roughly southern direction across a taiga area.

In its lower course it bends to the south before the Lena floodplain and flows slowly and meandering in a swampy channel.

[3] The largest tributary of the Biryuk is the 144 kilometres (89 mi) long Melichan (Меличан) that joins it from the right.