Lake Heiterwang is a lake in the Tirol, Austria, located at 47°27′30″N 10°46′50″E. Its surface is approximately 1.37 km2 and its maximum depth is 61 metres. It is well-known that Heiterwanger See is good for fishing. Kaiser Maximilian I of Austria often fished here.

Together with Plansee , this lake forms the second largest body of water in Tirol.