| South River State Forest | |
| Map: | USA Massachusetts#USA |
| Relief: | 1 |
| Location: | Franklin County, Massachusetts, United States |
| Coordinates: | 42.5575°N -72.6844°W |
| Elevation: | 243feet |
| Operator: | Massachusetts Department of Conservation and Recreation |
South River State Forest is located in Conway, Massachusetts. The forest is managed by the Department of Conservation and Recreation (DCR).
The South River State Forest consists of two separate sections—one adjacent to Bardwell's Ferry Bridge and the other where the old Conway Electric Street Railway met the New York, New Haven and Hartford Railroad line. Its name comes from the river that runs through it, part of the Deerfield River watershed.
The Mahican-Mohawk Trail runs through the park, often following the location of the abandoned New York, New Haven and Hartford Railroad.