The Kuchuk (Russian: Кучук) is a river in Altai Krai, Russia.

[1] The basin of the river is located in the Rodinsky and Blagoveshchensky districts.

The sources are at the southwestern end of the Ob Plateau, in lake Zhir-Kain,[1] a small lake located 8 kilometres (5.0 mi) to the south of Voznesenka.

The end of the Kulunda Main Canal is located by the Kuchuk near Novotroitsk.

[4] The longest tributary of the Kuchuk is an unnamed 14 km (8.7 mi) long river joining it from the left 93 km (58 mi) from its mouth.