| North Branch Sugar 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: | Sullivan |
| Subdivision Type4: | Towns |
| Subdivision Name4: | Grantham, Croydon, Newport |
| Length: | 10.1miles |
| Source1: | Confluence of Sawyer Brook and Stocker Brook |
| Source1 Location: | Grantham |
| Source1 Coordinates: | 43.4906°N -72.1356°W |
| Source1 Elevation: | 290order=flipNaNorder=flip |
| Mouth: | Sugar River |
| Mouth Location: | Newport |
| Mouth Coordinates: | 43.3906°N -72.1953°W |
| Mouth Elevation: | 232order=flipNaNorder=flip |
| Tributaries Left: | Bog Brook |
| Tributaries Right: | Littlefield Brook, Swamp Brook, Perkins Brook, Beaver Brook |
The North Branch of the Sugar River is a 10.1adj=midNaNadj=mid[1] river located in western New Hampshire in the United States. It is a tributary of the Sugar River, which flows to the Connecticut River, which flows to Long Island Sound.
The North Branch of the Sugar River begins at the confluence of Sawyer Brook and Stocker Brook in the town of Grantham, New Hampshire. The river flows south through the town of Croydon, reaching the Sugar River in the town of Newport. In Croydon, the river's flow is interrupted by Spectacle Pond, a 40acres two-lobed lake. New Hampshire Route 10 follows the North Branch for nearly its entire length.