| Harrys Brook | |
| Map: | Harrys Brook.JPG |
| Source1 Coordinates: | 40.3589°N -74.6483°W |
| Mouth Coordinates: | 40.3658°N -74.6278°W |
| Subdivision Type1: | Country |
| Mouth Elevation: | 52feet |
| River System: | Raritan River system |
Harrys Brook, also known as the H. Greenlands Brook,[1] is a tributary of the Millstone River in Mercer County, New Jersey in the United States.
Harrys Brook starts at 40.3589°N -74.6483°W,[1] near Princeton North. It flows northeast though the city before meeting with another tributary from the northwest. It crosses Route 27 and drains into the Millstone River at 40.3658°N -74.6278°W.[1]