The North Branch of the Millers River is a river in southwestern New Hampshire and northern Massachusetts in the United States. It is a tributary of the Millers River, which flows west to the Connecticut River, which in turn flows south to Long Island Sound, an arm of the Atlantic Ocean.
The North Branch rises in Rindge, New Hampshire, at the outlet of Island Pond. It flows west past East Rindge and Converseville to Lake Monomonac. From the lake's outlet in Massachusetts, the North Branch flows south parallel to U.S. Route 202, joining the Millers River at Whitney Pond in Winchendon.
The North Branch is 6.0 miles (9.7 km) long, 4.0 miles (6.4 km) of which are in New Hampshire,  with 2.0 miles (3.2 km) in Massachusetts. If the channel length of 2.9 miles (4.7 km) through Lake Monomonac were included, the total length would be 8.9 miles (14.3 km).
- New Hampshire GRANIT state geographic information system Archived 2013-08-03 at the Wayback Machine.