| Lees River | |
| Map: | Lees River (Massachusetts) map.jpg |
| Source1 Coordinates: | 41.7436°N -71.1891°W |
| Mouth Location: | Mount Hope Bay |
| Mouth Coordinates: | 41.7197°N -71.1957°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Massachusetts |
| Subdivision Type3: | County |
| Subdivision Name3: | Bristol County |
| Length: | 2.9miles |
The Lees River or Lee's River, shown on federal maps as the Lee River, is a 2.9adj=midNaNadj=mid[1] tidal river that forms part of the boundary between Swansea and Somerset, Massachusetts. It flows south to drain into Mount Hope Bay.
The first documented local shipyard was established on the river between 1707 and 1712 by Samuel Lee. Today the river is designated as a Class A, "outstanding resource" water.