| Ösbyträsk Nature Reserve | |
| Photo Width: | 240 |
| Map: | Sweden Stockholm |
| Map Width: | 240 |
| Location: | Värmdö Municipality, Sweden |
| Nearest City: | Gustavsberg |
| Coordinates: | 59.3267°N 18.4036°W |
| Established: | 2006[1] |
Ösbyträsk Nature Reserve (Swedish: Ösbyträsks naturreservat) is a nature reserve in Stockholm County in Sweden.
The nature reserve has been created to protect the lake Ösbyträsk and the surrounding area. The nature is varied and the area also has a rich cultural heritage. A 4.5km (02.8miles) long track for visitors goes around the lake.[1]