| Branch Back Brook | |
| Map: | Branch Back Brook.JPG |
| Source1 Coordinates: | 40.4167°N -74.875°W |
| Mouth Coordinates: | 40.4233°N -74.8625°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Progression: | Back Brook, Pike Run, Beden Brook, Millstone River, Raritan River, Atlantic Ocean |
| Mouth Elevation: | 180feet |
| River System: | Raritan River system |
Branch Back Brook is a small tributary of Back Brook in Hunterdon County, New Jersey, in the United States.
Branch Back Brook starts at 40.4167°N -74.875°W,[1] near the intersection of Route 202 and Route 179 by Lake Enterprises. It flows northeast and crosses Route 31 before joining Back Brook at 40.4233°N -74.8625°W.[1]