| Mengdong | |
| Native Name: | Va Gaeng Dum |
| Settlement Type: | Town |
| Coordinates: | 23.1475°N 99.2492°W |
| Subdivision Type: | Country |
| Subdivision Name: | China |
| Subdivision Type1: | Province |
| Subdivision Name1: | Yunnan |
| Subdivision Type2: | Prefecture-level city |
| Subdivision Name2: | Lincang |
| Subdivision Type3: | County |
| Subdivision Name3: | Cangyuan Va Autonomous County |
| Established Title: | Established time |
| Established Date: | 1936 |
| Unit Pref: | Metric |
| Area Total Km2: | 260.07 |
| Population As Of: | 2010 census |
| Population Total: | 35,741 |
| Population Density Km2: | auto |
| Postal Code Type: | Postal code |
| Postal Code: | 677499 |
| Area Code Type: | Phone number |
| Area Code: | 883 |
Mengdong(; Va:Gaeng Dum[1]) is a town of Cangyuan Va Autonomous County and the government seat of the county. Guangyun Temple was built in 1828, which is one of the major historical and cultural sites of China. Mengdong is also a land port of China which connects to Wa State of Myanmar.[2]