The South Branch of the Little Dead Diamond River is a 4.3-mile (6.9 km) long  river in northern New Hampshire in the United States. It is a tributary of the Little Dead Diamond River, located in the Androscoggin River watershed of Maine and New Hampshire.
The river rises in the township of Dix's Grant on the eastern slopes of Crystal Mountain, a seven mile long ridge. The river flows northeast into the Atkinson and Gilmanton Academy Grant, then joins the Little Dead Diamond in the Dartmouth College Grant.
- New Hampshire GRANIT state geographic information system Archived 2013-08-03 at the Wayback Machine.
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