The Middle Branch of the Dead Diamond River is a 9.0-mile (14.5 km) long  river in northern New Hampshire in the United States. It is a tributary of the East Branch of the Dead Diamond River, located in the Androscoggin River watershed of Maine and New Hampshire.
The Middle Branch flows for most of its length through Pittsburg, the northernmost town in New Hampshire. It flows southeast through a wide valley between Magalloway Mountain (3,383 feet above sea level) to the south and Diamond Ridge (3,230 ft) to the north. The river then turns south and flows parallel to the East Branch of the Dead Diamond, finally joining it in the Atkinson and Gilmanton Grant, less than one mile upstream from the confluence of the East Branch and the West Branch of the Dead Diamond.
- New Hampshire GRANIT state geographic information system Archived 2013-08-03 at the Wayback Machine.
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