The Rattlesnake River is a 3.6-mile-long (5.9 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 north of Hussey Mountain and Chesley Mountain and flows east to the Cocheco River, dropping 500 feet in elevation over its length.
- New Hampshire GRANIT state geographic information system Archived 2013-08-03 at the Wayback Machine.
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