|Towns||Waterville Valley, Sandwich, Albany, Tamworth|
|• location||White Mountain National Forest|
|• elevation||2,320 ft (710 m)|
|740 ft (230 m)|
|Length||7.6 mi (12.2 km)|
|• left||Spring Brook|
|• right||Sanborn Brook|
The Wonalancet River is a 7.6-mile-long (12.2 km) river in the White Mountains of New Hampshire in the United States. Named after the 17th-century Pennacook sachem Wonalancet, it is a tributary of the southern Swift River, part of the Bearcamp River / Ossipee Lake / Saco River watershed leading to the Atlantic Ocean.
The Wonalancet River rises in the heart of the Sandwich Range, in "The Bowl", a forested glacial cirque lying between Mount Whiteface to the west, Mount Passaconaway to the north, and Mount Wonalancet to the east. The river flows south, paralleled by the Dicey Mill Trail, out of the mountains into the communities of Ferncroft, in the southwest corner of the town of Albany, and Wonalancet, in the northwest corner of the town of Tamworth. The river continues east into a forested valley and joins the Swift River 3 miles (5 km) northwest of Tamworth village.