The Mattawamkeag River is a river in Maine.

From the confluence of its East Branch and West Branch (45°50′00″N 67°59′27″W / 45.8334°N 67.9907°W / 45.8334; -67.9907 (Mattawamkeag River source)) in Haynesville, about 10 miles (16 km) west of the Canada–United States border, the river runs 50.6 miles (81.4 km)[1] south and west to its mouth on the Penobscot River in Mattawamkeag.

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