| North Branch Contoocook River | |
| Name Other: | North Branch 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: | Cheshire, Hillsborough |
| Subdivision Type4: | Towns |
| Subdivision Name4: | Stoddard, Antrim, Hillsborough |
| Length: | 16.8miles |
| Source1: | Robb Reservoir |
| Source1 Location: | Stoddard |
| Source1 Coordinates: | 43.0392°N -72.0678°W |
| Source1 Elevation: | 386order=flipNaNorder=flip |
| Mouth: | Contoocook River |
| Mouth Location: | Hillsborough |
| Mouth Coordinates: | 43.1075°N -71.9097°W |
| Mouth Elevation: | 585feet |
| Tributaries Left: | Morse Brook, Beards Brook |
| Tributaries Right: | Salmon Brook |
The North Branch of the Contoocook River (officially the North Branch River) is a 16.8adj=midNaNadj=mid[1] river in southwestern New Hampshire in the United States. It is a tributary of the Contoocook River, part of the Merrimack River watershed.
The North Branch begins in a highland region of lakes, swamps, and intricate stream networks in the town of Stoddard, New Hampshire. The U.S. Geographic Names Information System places the beginning of the North Branch at the outlet of Robb Reservoir in the southeast corner of Stoddard. Additional significant flow quickly arrives when the outlet of Highland Lake and Island Pond joins from the north. From here to Franklin Pierce Lake, the North Branch consists of a stairstep-like series of flatwater and wetland sections interspersed with sections of whitewater that are popular among New England kayakers. Below Franklin Pierce Lake it is a short distance to the Contoocook River in Hillsborough. Beards Brook enters the North Branch in Hillsborough just upstream of the river's end at the Contoocook.
New Hampshire Route 9 follows the North Branch for most of the river's length.