Mollidgewock Brook is a 12.6-mile (20.3 km) long  stream in northern New Hampshire and western Maine in the United States. It is a tributary of the Androscoggin River, which flows south and east into Maine, joining the Kennebec River near the Atlantic Ocean.
Mollidgewock Brook flows out of Mollidgewock Pond in the town of Upton, Maine and heads west, quickly entering New Hampshire. The brook flows west and north through swampy areas and past low hills in the township of Cambridge before joining the Androscoggin River in the town of Errol.
In 2009, The Trust for Public Land added 3,100 acres (1,300 ha) of the Mollidgewock Brook lands to the Umbagog National Wildlife Refuge. The remaining 1,800 acres (730 ha) were added to 13 Mile Woods, Errol's community forest. 
- New Hampshire GRANIT state geographic information system Archived 2013-08-03 at the Wayback Machine.
- "Mollidgewock Brook". The Trust for Public Land.
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