| Nussensee | |
| Location: | Upper Austria, Austria |
| Coordinates: | 47.7042°N 13.5717°W |
| Type: | lake |
| Length: | 600m (2,000feet) |
| Width: | 250m (820feet) |
| Max-Depth: | 14.7m (48.2feet) |
| Pushpin Map: | Austria |
| Pushpin Map Alt: | Location of the lake in Upper Austria. |
Nussensee is a lake in Upper Austria. It is located at Bad Ischl in the Salzkammergut. It has an area of approximately and a maximum depth of 14.7m (48.2feet). The Nussensee is about 600m (2,000feet) long and up to 250m (820feet) wide. It is fed almost entirely by underground springs and is subject to fluctuations in level of several metres. This helps support rare plants such as the common water chestnut (Trapa natans) grow near the lake.