The South Branch of the Souhegan River is a 5.8-mile-long (9.3 km)^[1] river located in northern Massachusetts and southern New Hampshire in the United States. It is a tributary of the Souhegan River, which flows to the Merrimack River and ultimately to the Gulf of Maine.

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South Branch Souhegan River
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Location
Country	United States
States	Massachusetts, New Hampshire
Counties	Worcester, MA, Middlesex, MA, Hillsborough, NH
Towns	Ashburnham, MA, Ashby, MA, New Ipswich, NH
Physical characteristics
Source	Stodge Meadow Pond
• location	Ashburnham, MA
• coordinates	42°40′11″N 71°52′53″W
• elevation	1,129 ft (344 m)
Mouth	Souhegan River
• location	New Ipswich, NH
• coordinates	42°43′52″N 71°50′47″W
• elevation	927 ft (283 m)
Length	5.8 mi (9.3 km)

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The South Branch begins near Mount Watatic at the outlet of Stodge Meadow Pond in the town of Ashburnham, Massachusetts, and flows north through a chain of small lakes (Marble Pond, Ward Pond, and Watatic Pond) before turning northeast into the town of Ashby, Massachusetts. North of Ashby, the river enters New Ipswich, New Hampshire, passes through a small flood control reservoir, and joins the West Branch to form the Souhegan River, just north of the intersection known as "Gibson Four Corners".

• List of rivers of Massachusetts
• List of rivers of New Hampshire