Mamry (German: Mauersee, Lithuanian: Mauras) is a lake in the Masurian Lake District of Poland's Warmia-Mazury Province. It is the second largest lake in Poland, with an area of 104 km.² Maximum depth is 44 m, average is 11 m.
It actually comprises six connected lakes: Mamry, Kirsajty, Kisajno, Dargin, Święcajty and Dobskie. Mamry features 33 islands, totalling 213 hectares, some of which are ornithological reserves.
Lake Mamry is a popular tourist destination. It is connected to the Pregolya and the Baltic Sea by the disused Masurian Canal. The largest town on the lake is Giżycko.
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