The Little Sugar River is a 13.5-mile-long (21.7 km) river located in western New Hampshire in the United States.[1] It is a tributary of the Connecticut River, which flows to Long Island Sound. The river flows parallel to and approximately 5 miles (8.0 km) south of the Sugar River.
The Little Sugar River begins on a tableland in the town of Unity, New Hampshire, then drops rapidly to the west, cutting a small gorge past the north end of Perry Mountain, and enters the town of Charlestown. The river reaches the Connecticut just west of the village of North Charlestown.