Walchsee is a lake in Kufstein District in both Walchsee and Kössen municipalities, Tyrol, Austria.
Its surface area of 95.3 hectares (235 acres) makes it the fourth largest natural waterbody in the state. Its maximum depth is 21.2 metres (70 ft), and its maximum volume is 11,782,560 cubic metres (416,097,000 cu ft).
Coordinates: 47°38′46″N 12°19′26″E / 47.646°N 12.324°E