| Offensee | |
| Location: | Upper Austria |
| Coordinates: | 47.75°N 63°W |
| Type: | lake |
| Pushpin Map: | Austria |
| Pushpin Map Alt: | Location of the lake in Upper Austria. |
Offensee is a lake located at the western end of the Totes Gebirge mountain range in Upper Austria's part of the Salzkammergut.