Lake Roś (Polish: Jezioro Roś, German: Roschsee) is a lake in the Masurian Lake District of the Warmian-Masurian Voivodeship of Poland.

The S-shaped glacial lake has an area of 18.88 km2 (7.29 sq mi) and a maximum depth of 31.8 metres (104 feet).

[2] The Swięcek and Konopka rivers flow into the lake, while the Pisa River flows out of it.

The largest town on the lake is Pisz.

This article about a location in Warmian-Masurian Voivodeship is a stub.