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The 'Rattle River' is a 4.0 mile long (6.5 km) river in the White Mountains of New Hampshire in the United States. It is a tributary of the Androscoggin River, which flows east into Maine, joining the Kennebec River near the Atlantic Ocean.
The Rattle River rises in the saddle between Middle Moriah and Shelburne Moriah Mountain in the town of Shelburne. The river (better described as a large brook) flows north to the Androscoggin, dropping from 2,800 to 700 feet above sea level over its length.
The Appalachian Trail follows the river from its source to the Androscoggin River valley.