Inselsee is a lake in the Rostock district in Mecklenburg-Vorpommern, Germany.

The lake is divided into two parts by a small 60 ha island „Schöninsel“.

While the northern part of the lake is relatively flat, the average depth of the southern part is up to 6 m. The island (Schöninsel) is connected to the mainland by a bridge.

The lake is located in the town limits of Güstrow, south of the city center.

On the southern shore of Inselsee, the studio of Ernst Barlach, a German sculptor, is located.