| Hafnersee | |
| Location: | Keutschach am See municipality, Carinthia, Austria |
| Coordinates: | 46.5833°N 22°W |
| Type: | lake |
| Islands: | 0 |
| Cities: | Plescherken |
| Pushpin Map: | Austria |
| Pushpin Map Alt: | Location of the lake in Austria. |
Hafnersee is a small natural lake (0.159397 km²) of Carinthia, Austria.