| Lake Koosa | |
| Pushpin Map: | Estonia |
| Location: | Vara Parish, Tartu County, Estonia |
| Basin Countries: | Estonia |
| Length: | 3360m (11,020feet) |
| Width: | 1240m (4,070feet) |
| Area: | 281.3ha |
| Depth: | 1.2m (03.9feet) |
| Max-Depth: | 1.9m (06.2feet) |
| Volume: | 3540000m2 |
| Elevation: | 30.1m (98.8feet) |
Lake Koosa is a lake of Estonia located in Vara Parish.