| Achit Lake | |
| Pushpin Map: | Mongolia |
| Location: | Uvs Aimag |
| Coords: | 49.5°N 120°W |
| Basin Countries: | Mongolia |
| Length: | 28km (17miles) |
| Width: | 16km (10miles) |
| Area: | 290km2 |
| Elevation: | 1435m (4,708feet) |
Achit Lake (Mongolian: Ачит Нуур,, Chinese: 阿奇特湖) is the largest freshwater lake in Uvs Aimag (Uvs province), Mongolia, in the west of the country. At an elevation of 1,435 m above sea level it covers an area of 290 km2. It is 28 km long, 16 km wide, and 10 m deep. The coast is covered with steppes, mostly hilly but swampy on the northwest and northeast. Several rivers flow into the lake.