| Khanui River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Mongolia |
| Subdivision Type2: | Aimags |
| Subdivision Name2: | Arkhangai, Bulgan |
| Length: | 421km (262miles) |
| Source1: | Khan-Öndör Uul |
| Source1 Location: | Chuluut sum, Arkhangai aimag |
| Source1 Coordinates: | 47.4167°N 125°W |
| Mouth: | Selenga |
| Mouth Location: | Khishig-Öndör sum, Bulgan aimag |
| Mouth Coordinates: | 49.3458°N 102.3597°W |
| Basin Size: | 14620km2 |
Khanui River is a river flowing down through the valleys of the Khangai Mountains in central Mongolia. It starts in the Chuluut sum of Arkhangai aimag at the north slopes of the Khan-Öndör mountain.[1] It passes next to the center of Erdenemandal sum, and ends in the Khutag-Öndör sum of Bulgan aimag where it discharges into the Selenge.[2] It is long, and has a drainage basin of .[3]