| Chuya | |
| Mouth: | Katun |
| Mouth Coordinates: | 50.3866°N 86.6732°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Length: | 232km (144miles) |
| Basin Size: | 9550km2 |
The Chuya (Russian: Чуя; Southern Altai: Чуй, Çuy) is a river in the Altai Republic in Russia, a right tributary of the Katun (Ob's basin). The Chuya is 320km (200miles) long, and its drainage basin covers 11200km2. 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.