| Lake Ossiach | |
|---|---|
| Ossiacher See (German) | |
 | |
  Lake Ossiach | |
| Location | Carinthia |
| Coordinates | 46°40′N 13°58′E / 46.667°N 13.967°E |
| Primary inflows | Tiebel Creek |
| Primary outflows | Seebach to Drava river |
| Basin countries | Austria |
| Max. length | 10.7875 km (6.7030 mi) |
| Max. width | 1,540 m (5,050 ft) |
| Surface area | 10.38 km2 (4.01 sq mi) |
| Average depth | 19.6 m (64 ft) |
| Max. depth | 52.6 m (173 ft) |
| Water volume | 206.28 km3 (167,230,000 acre⋅ft) |
| Residence time | 1.8 years |
| Surface elevation | 501 m (1,644 ft) |
| Settlements | Annenheim, Sattendorf, Bodensdorf, Steindorf, Ossiach |
Lake Ossiach (German: Ossiacher See, Slovene: Osojsko jezero) is a lake in the Austrian state of Carinthia. It is the state's third largest lake after Lake Wörth (German: Wörthersee) and Lake Millstatt (German: Millstätter See).