| Udsu Lake | |
| Location: | Tõrva Parish, Valga County, Estonia |
| Pushpin Map: | Estonia |
| Basin Countries: | Estonia |
Udsu Lake is a lake of Estonia, located in Jeti village, Tõrva Parish, Valga County. Udsu is one of the deepest lake in Estonia; maximum depth 30.2 m. Udsu surface area is 6.9 ha.[1]
Udsu is oligotrophic lake.
Udsu belongs to Koorküla Nature Reserve.