| Red Flag Lake | |
| Other Name: | Red Flag Reservoir |
| Pushpin Map: | China |
| Pushpin Map Caption: | Location in China. |
| Location: | Zhenning Buyei and Miao Autonomous County, Guizhou, China |
| Coords: | 26.0802°N 105.7764°W |
| Type: | Artificial lake |
| Outflow: | Zhenning River |
| Basin Countries: | China |
| Area: | 5km2 |
| Max-Depth: | 10.8m (35.4feet) |
| Volume: | 832600m2 |
Red Flag Lake, also known as Red Flag Reservoir, is an artificial lake in Zhenning Buyei and Miao Autonomous County, Guizhou, China. It covers a total surface area of 5km2 and has a storage capacity of some 832600m2 of water. The lake discharges into the Zhenning River.
The lake provides drinking water and water for irrigation.
The dam is 10.8m (35.4feet) high and made of stones.