| Randolph Brook | |
| Map: | Randolph Brook.JPG |
| Source1 Coordinates: | 40.535°N -74.5606°W |
| Mouth Coordinates: | 40.5508°N -74.5481°W |
| Subdivision Type1: | Country |
| Mouth Elevation: | 20feet |
| River System: | Raritan River system |
Randolph Brook is a tributary of the Millstone River in northern Franklin Park, New Jersey, United States.
Randolph Brook starts at 40.535°N -74.5606°W,[1] near Randolph Road. It crosses Randolph Road and Westons Canal Road before flowing under the Delaware and Raritan Canal and draining into the Millstone River at 40.5508°N -74.5481°W.[1]