| Ahornsee | |
| Location: | Upper Austria |
| Coordinates: | 47.4668°N 13.7825°W |
| Inflow: | underground |
| Outflow: | underground |
| Pushpin Map: | Austria |
| Pushpin Map Alt: | Location of the lake in Austria. |
Ahornsee is a mountain lake in the Dachstein Mountains of Upper Austria.