| West Branch Warner 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: | Merrimack |
| Subdivision Type4: | Towns |
| Subdivision Name4: | Newbury, Bradford |
| Length: | 6.5miles |
| Source1: | Mount Sunapee |
| Source1 Location: | Newbury |
| Source1 Coordinates: | 43.2458°N -72.0578°W |
| Source1 Elevation: | 492m (1,614feet) |
| Mouth: | Warner River |
| Mouth Location: | Bradford |
| Mouth Coordinates: | 43.2681°N -71.9653°W |
| Mouth Elevation: | 650feet |
The West Branch of the Warner River is a 6.5adj=midNaNadj=mid[1] river in central New Hampshire in the United States. It is a tributary of the Warner River, part of the Contoocook River (and ultimately Merrimack River) watershed.
The West Branch rises in the southwest corner of Newbury, New Hampshire, on the eastern slopes of Mount Sunapee. Flowing east, it quickly enters the town of Bradford, reaching the Warner River at the town center.