| Mangshi River 芒市河 | |
| Map: | 芒市河流域图.png |
| Map Size: | 220px |
| River System: | Irrawaddy River |
| Source1 Location: | Jingzhuping Village in Longxin Township, Longling County, Baoshan[1] |
| Source1 Elevation: | 2,235 m |
| Mouth Location: | Gazhong Village in Zhefang, Mangshi, Dehong Dai and Jingpo Autonomous Prefecture |
| Mouth Coordinates: | 24.1691°N 98.1255°W |
| Mouth Elevation: | 783 m |
| Basin Size: | 1,881 km² |
| Basin Population: | 0.29 million (2004) |
| Length: | 117.1 km |
| Discharge1 Avg: | 62.3 m³/s |
Mangshi River (Chinese: 芒市河; ᥘᥛᥳ ᥑᥩᥢᥴ) also called Mangshi Large River (Chinese: 芒市大河), is a river in western Yunnan, mainly in the territory of Mangshi City. It is the largest tributary river of Shweli River in China, which is a tributary river of Irrawaddy. The source of Mangshi River is at Longxin Township in Longling County, Baoshan, and the upper also called Bawan River (Chinese: 八湾河). Mangshi River flows through the west fields of Mangshi city, and it flows in Shweli River at Gazhong Village (Chinese: 戛中村) in Zhefang. It is the mother river of Mangshi.[2] The length of Mangshi River is 117.1 km, and the basin size is 1,881 km², about 61.3% of area of Mangshi City.[3] [4] [5]