Rock Brook is a tributary of Beden Brook in Somerset County, New Jersey in the United States.

Rock Brook starts at 40°26′1″N 74°44′41″W / 40.43361°N 74.74472°W / 40.43361; -74.74472. It flows south through the town of Skillman, picking up several tributaries, until it enters a dammed section called Sylvan Lake. It then continues west before draining into Beden Brook at 40°24′39″N 74°40′24″W / 40.41083°N 74.67333°W / 40.41083; -74.67333.

• Cat Tail Brook

• Pike Run

• List of rivers of New Jersey

• USGS Coordinates in Google Maps