Lake Kuchuk or Kuchukskoye (Russian: Кучукское озеро) is a bittern salt lake in the southern part of the West Siberian Plain, Blagoveshchensky District, Altai Krai, south-central Russia.

It has an oval shape and is located 5 kilometers (3.1 mi) to the south of Lake Kulunda in the eastern side of the Kulunda Plain, near the western limit of the Ob Plateau.

The Kuchuk river flows into the eastern shore of the lake.

Lake Bauzhansor lies 13 kilometers (8.1 mi) to the northwest, Shukyrtuz 33 kilometers (21 mi) to the southwest, and Lake Mostovoye 72 kilometers (45 mi) to the northeast.

[4][3] This Altai Krai location article is a stub.