Little Bear Brook is a tributary of the Millstone River in Mercer County, New Jersey in the United States.

The Little Bear Brook's source is at 40°19′1″N 74°38′13″W / 40.31694°N 74.63694°W / 40.31694; -74.63694. It flows northeast, crossing Alexander Road and Washington Road (CR-571) before draining into the Millstone River at 40°19′43″N 74°37′29″W / 40.32861°N 74.62472°W / 40.32861; -74.62472.

• Beden Brook
• Bear Brook
• Cranbury Brook
• Devils Brook
• Harrys Brook
• Heathcote Brook
• Indian Run 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