| Nathan | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Scotland |
| Length: | 20.92km (13miles)[1] |
| Source1 Location: | Glenbuck, East Ayrshire, Scotland |
| Source1 Coordinates: | 55.5333°N -62°W |
| Mouth: | River Clyde |
| Mouth Location: | Crossford, South Lanarkshire, Scotland |
| Mouth Coordinates: | 55.7°N -3.8708°W |
The River Nethan is a river which flows between Glenbuck in East Ayrshire and Crossford, South Lanarkshire where it feeds into the River Clyde, with the town of Lesmahagow and surrounding villages sitting on the river course. The area of woodland surrounding the River Nethan at Crossford and Auchenheath has been declared a site of special scientific interest and forms a part of the Clyde Valley Woodlands National Nature Reserve as Nethan Gorge. Craignethan Castle, a 16th-century fortification, overlooks the river.