| West Branch Mad 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: | County |
| Subdivision Name3: | Grafton |
| Subdivision Type4: | Town |
| Subdivision Name4: | Waterville Valley |
| Length: | 3.2miles |
| Source1: | Mount Tecumseh |
| Source1 Location: | Waterville Valley |
| Source1 Coordinates: | 43.9719°N -71.5578°W |
| Source1 Elevation: | 3200feet |
| Mouth: | Mad River |
| Mouth Location: | Waterville Valley |
| Mouth Coordinates: | 43.955°N -71.5122°W |
| Mouth Elevation: | 1454feet |
| Tributaries Left: | Osceola Brook |
| Tributaries Right: | Tecumseh Brook |
The West Branch of the Mad River is a 3.2adj=midNaNadj=mid[1] stream located in the White Mountains of New Hampshire in the United States. It is a tributary of the Mad River, part of the Pemigewasset River and ultimately the Merrimack River watershed.
The West Branch rises on the northern slopes of Mount Tecumseh, and drops northeast into Thornton Gap, between Mount Tecumseh and Mount Osceola, two major summits of the White Mountains. The stream turns east, paralleled by Tripoli Road, until it encounters Osceola Brook joining from the north, then turns south into the intervale in which the village of Waterville Valley is situated. The West Branch joins the Mad River close to the center of the Waterville Valley resort.