The Chuya (Russian: Чуя; Altay: Чуй, Çuy) is a river in the Altai Republic in Russia, a right tributary of the Katun (Ob's basin). The Chuya is 320 kilometres (200 mi) long, and its drainage basin covers 11,200 square kilometres (4,300 sq mi). The river freezes in October or early November and thaws in late April. The town Kosh-Agach lies on the Chuya. The Chuya Highway (R256) runs through its valley. One of its tributaries is the Chibitka.