| Kitoy | |
| Mouth: | Angara |
| Mouth Coordinates: | 52.6539°N 103.899°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Length: | 316km (196miles) |
| Basin Size: | 9190km2 |
The Kitoy is a river in Buryatia and Irkutsk Oblast in Russia, a left tributary of the Angara. The length of the river is 316 km. The area of its basin is 9,190 km². The Kitoy freezes up in the second half of October and stays icebound until late April through early May. The city of Angarsk is located on the Kitoy.