| Nøklevann | |
| Image Bathymetry: | Nøklevann.svg |
| Location: | Oslo, Norway |
| Coords: | 59.8753°N 10.8769°W |
| Type: | Natural lake |
| Pushpin Map: | Norway |
| Outflow: | Ljanselva |
| Basin Countries: | Norway |
| Area: | 0.63km2[1] |
| Max-Depth: | 34m (112feet) |
| Elevation: | 163m (535feet) |
Nøklevann is a lake in Østmarka in Oslo, Norway. It has a surface area of 0.8 km², and is 163 meters above sea level. The lake drains through Ljanselva to Bunnefjorden. It is a former drinking water supply for Oslo.[2]