Kummerower See, Natural lake in Mecklenburg-Western Pomerania, Germany.

Kummerower See is a lake in Mecklenburg-Vorpommern, Germany, about 11 km long and 4 km wide on average, with a maximum depth of 23.3 m. Its western shore is heavily reeded and marshy, while the eastern shore has less reed. The lake lies between Malchin, Dargun and Demmin, and its outflow is the Peene.

The Kummerower See lies in the Malchiner Becken, a glacial channel about 30 km long shaped by meltwater beneath the ice during the Pomeranian stage of the Weichsel glaciation. In the 13th century the fishing rights on the lake were disputed between the town of Demmin and the monasteries of Dargun and Verchen, which used forged, backdated charters. In 1292 the Pomeranian dukes settled the conflict with Dargun, granting the monastery fishing and a fish weir in the Peene, while Demmin kept free navigation and could fish only with small nets and hooks.

The lake takes its name from the village of Kummerow on its southern shore. In the 13th century, fishing rights on the lake were disputed between the town of Demmin and the monasteries of Dargun and Verchen; the monasteries used forged charters backdated to support their claims. Demmin eventually bought Verchen's rights, and in 1292 the Pomeranian dukes settled the dispute with Dargun, allowing the monastery to fish and operate a fish weir in the Peene while Demmin kept free navigation.

The west shore is heavily reeded and marshy; dry-foot access to the water is possible only at Salem, where the lake bed also drops most steeply. The east shore has far less reed growth. A 2.8 km nature trail runs from Verchen on the northeast shore to the Gravelotte harbour, and excursion boats operate on the lake.

The lake's surface usually lies 20 to 30 cm above sea level, yet the bed of the Peene from the outflow to its mouth stays at least 1.5 m below sea level. Water levels and even flow direction here are therefore governed by the Oder, the Stettiner Haff and the Pomeranian Bay.