The Mad River is a 5.2-mile-long (8.4 km)  river in eastern New Hampshire in the United States. It is a tributary of the Cocheco River, part of the Piscataqua River watershed leading to the Atlantic Ocean.
The river is located entirely in the town of Farmington. It rises in Nubble Pond, between Nubble Mountain and Hussey Mountain, and flows northwest, then northeast, reaching the Cocheco near the town center of Farmington. The river drops more than 500 feet (150 m) over its 5-mile (8 km) route, in places falling over scenic ledges.
- New Hampshire GRANIT state geographic information system Archived 2013-08-03 at the Wayback Machine.
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