| Wonalancet River | |
| Pushpin Map: | New Hampshire#USA |
| Pushpin Map Size: | 250 px |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New Hampshire |
| Subdivision Type3: | Counties |
| Subdivision Name3: | Grafton, Carroll |
| Subdivision Type4: | Towns |
| Subdivision Name4: | Waterville Valley, Sandwich, Albany, Tamworth |
| Length: | 7.6miles |
| Source1: | Sandwich Range |
| Source1 Location: | White Mountain National Forest |
| Source1 Coordinates: | 42.9428°N -71.3939°W |
| Source1 Elevation: | 2320feet |
| Mouth: | Swift River |
| Mouth Location: | Tamworth |
| Mouth Coordinates: | 43.8942°N -71.2964°W |
| Mouth Elevation: | 740feet |
| Tributaries Left: | Spring Brook |
| Tributaries Right: | Sanborn Brook |
The Wonalancet River is a 7.6adj=midNaNadj=mid[1] 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 3miles northwest of Tamworth village.