The Chikoy (, Tsökh gol;, Sükhe gol) is a river in Zabaykalsky Krai and the Buryat Republic in Russia, which partially flows along the Russia-Mongolia border. It is a right tributary of the Selenga. The length of the Chikoy is 769 km. The area of its basin is 46200 km2.

Course

The Chikoy has its source in the Chikokon Range, in the northern slopes of the Bystrinsky Golets peak. Its valley forms the northwestern limit of the Khentei-Daur Highlands. The river usually freezes over in late October or early November and stays icebound until April or early May. Its largest tributary is the Menza.