| Lake Nepahwin | |
| Location: | Sudbury, Ontario |
| Coords: | 46.458°N -80.99°W |
| Lake Type: | Glacial |
| Pushpin Map: | Ontario |
| Basin Countries: | Canada |
| Area: | 1.28km2 |
| Max-Depth: | 22m (72feet) |
| Shore: | 9.9km (06.2miles) |
| Elevation: | 263m (863feet) |
| Islands: | Gordon, Meda, McMahon's, Duck, two unnamed |
Lake Nepahwin is a lake in Sudbury, Ontario, located to the south of the city's downtown area.
Its name is derived from an old native term meaning "sleeping lake". It was adopted on August 4, 1949 following a community plebiscite.