Harrys Brook, also known as the H. Greenlands Brook, is a tributary of the Millstone River in Mercer County, New Jersey in the United States.

Harrys Brook starts at 40°21′32″N 74°38′54″W / 40.35889°N 74.64833°W / 40.35889; -74.64833, 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°21′57″N 74°37′40″W / 40.36583°N 74.62778°W / 40.36583; -74.62778.

• Beden Brook
• Bear Brook
• Cranbury Brook
• Devils Brook
• Heathcote Brook
• Indian Run Brook
• Little Bear Brook
• Millstone Brook
• Peace Brook
• Rocky Brook
• Royce Brook
• Simonson Brook
• Six Mile Run
• Stony Brook
• Ten Mile Run
• Van Horn Brook

• List of rivers of New Jersey

• USGS Coordinates in Google Maps