| Hong River | |
| Name Other: | Hongru River, Ru River |
| Subdivision Type1: | Country |
| Subdivision Name1: | China |
| Subdivision Type2: | State |
| Subdivision Name2: | Henan, Anhui |
| Subdivision Type3: | Region |
| Subdivision Name3: | Northern China and Eastern China |
| Length: | 202.56abbr=onNaNabbr=on, Northwest-Southeast |
| Source1 Location: | Near Wugang, Henan province, China |
| Mouth: | Huai River |
| Mouth Location: | Near Funan County, Anhui Province, China |
| Mouth Coordinates: | 32.4099°N 115.5477°W |
| River System: | Huai River watershed |
Hong River is a major tributary river of Huai River system. Its source is on the western slope of Dengtaijia Peak near the border between the city of Wugang and Biyang County of Henan province. If flows for about before meeting the Huai River near the provincial border between Henan and Anhui provinces. The lower section of Hong River is also called Hongru River (洪汝河), as it follows the lower course of a historical Ru River (汝水) that was artificially redirected during Yuan and Ming dynasties. Suya Lake on Hong River is the largest reservoir on the plain in China.