Moosseedorf is a municipality in the Bern-Mittelland administrative district in the Canton of Bern in Switzerland. The village is located south of Moossee , the lake that gives it its name.

Moosseedorf is first mentioned in 1242 as Sedorf. In 1389 it was mentioned as Mossedorf. In the 18th and early 19th century, it officially became Moosseedorf to avoid confusion with Seedorf in the District of Aarberg, which is also in the Canton of Bern.

Two of the largest paleolithic sites in Switzerland, Moosbühl I and II, are located on a low hill near Moossee Lake.