The Merrymeeting River is a 10.0-mile-long (16.1 km)^[1] river in the Lakes Region of central New Hampshire in the United States. It is a tributary of Lake Winnipesaukee, part of the Merrimack River watershed.

Merrymeeting River
The Merrymeeting River in Alton, New Hampshire
Show map of New Hampshire Show map of the United States
Location
Country	United States
State	New Hampshire
Counties	Strafford, Belknap
Towns	New Durham, Alton
Physical characteristics
Source	Merrymeeting Lake
• location	New Durham
• coordinates	43°28′38″N 71°10′44″W / 43.47722°N 71.17889°W / 43.47722; -71.17889
• elevation	647 ft (197 m)
Mouth	Lake Winnipesaukee
• location	Alton Bay
• coordinates	43°28′12″N 71°14′2″W / 43.47000°N 71.23389°W / 43.47000; -71.23389
• elevation	504 ft (154 m)
Length	10.0 mi (16.1 km)
Basin features
Tributaries
• left	Coffin Brook

The river begins at the outlet of Merrymeeting Lake in the town of New Durham. The river flows south through a chain of ponds to the village proper of New Durham. After passing under New Hampshire Route 11, the river enters Merrymeeting Marsh and turns sharply to the northwest, the course it will take the rest of the way to its end. The river crosses a small dam at Alton and reaches Lake Winnipesaukee at the community of Alton Bay, the southernmost point on the lake.