Schermützelsee, Natural lake in Brandenburg, Germany

Schermützelsee is a 137-hectare lake in the Märkische Schweiz Nature Park, about 50 km east of Berlin, with its entire surface within Buckow. It lies at the western edge of the Buckower Kessel, a basin of the Weichselian Buckower Rinne below the Barnim slope. Its maximum depth of 38 m lies about 12 m below sea level; it is fed by groundwater and the Sophienfließ and drains via the Stobber to the Oder.

Pile dwellings attributed to the Lusatian culture show early settlement of the shores. Until the mid-16th century the lake belonged to the Cistercian convent of Friedland, then passed to various estate owners, and since 1929 it has been owned by the town of Buckow. The Strandbad Buckow opened on the northeastern shore in 1911.

The Brecht-Weigel-Haus on the eastern shore served as the summer retreat for playwright Bertolt Brecht and actress Helene Weigel. Today it functions as a museum, offering visitors insight into the life and work of this influential artistic couple.

The Strandbad Buckow lies on the northeastern shore, reached by the K 6413 road and by mobus buses stopping at the lido; the Buckower Kleinbahn museum railway station is about 800 m east of the lake's southern tip. A 7.5 km circular path runs around the lake, partly as a panorama trail high on the Barnim slope. The lido's wooden diving tower was rebuilt in 2010 on a galvanized steel foundation, modelled on the 1920s tower.

A historic passenger vessel called MS Scherri has operated on the lake since the 1990s, originally coming from Hamburg. Built in the late 1800s, this ship offers visitors romantic cruises across the water.