| Squannacook River Dam | |
| Name Official: | Squannacook River Dam |
| Dam Crosses: | Squannacook River |
| Res Name: | Squannacook River Reservoir |
| Location: | Groton / Shirley, Middlesex County, Massachusetts, USA |
| Operator: | Massachusetts Power Company |
| Dam Height: | 30 ft |
The Squanacook River Dam is just south of Groton Road between Groton and Shirley in Middlesex County, Massachusetts. It is one of five dams on the Squannacook River, which forms the boundary between Groton and Shirley.