| Langesjøen | |
| Location: | Nore og Uvdal (Buskerud) |
| Pushpin Map: | Norway |
| Outflow: | Numedalslågen |
| Basin Countries: | Norway |
| Length: | 12km (07miles) |
| Width: | 1.6km (01miles) |
| Area: | 10.78km2 |
| Shore: | 35.15km (21.84miles) |
| Elevation: | 1206m (3,957feet) |
| Reference: | NVE |
Langesjøen is a lake in the municipality of Nore og Uvdal in Buskerud, Norway. Langesjøen is located ln Hardangervidda. Djupa flows out of Langesjøen to form part of the Numedalslågen watershed (Numedalsvassdraget).[1]