The Kitoy (Russian: Китой, Buryat: Хути, romanized: Khuti) 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.