Schaalsee is a 24 km2 (9.3 sq mi) lake in Germany.

It forms part of the border between Schleswig-Holstein (district Herzogtum Lauenburg) and Mecklenburg-Vorpommern (districts Ludwigslust-Parchim and Nordwestmecklenburg).

The town of Zarrentin is located on its southern shores.

Other municipalities on the lake are Seedorf, Sterley, Salem, Kittlitz and Kneese.

This article related to a protected area in Europe is a stub.