Heathcote Brook, also known as Heathcote Run, is a tributary of the Millstone River in central New Jersey in the United States.

Heathcote Brook starts at 40°24′32″N 74°33′34″W / 40.40889°N 74.55944°W / 40.40889; -74.55944,[1] near the intersection of New Road and Route 1.

It runs through a residential area and crosses Route 1.

It then joins with the Carters Brook, crosses Heathcote Road, and drains into the Millstone River at 40°22′25″N 74°37′12″W / 40.37361°N 74.62000°W / 40.37361; -74.62000.

[1] Numerous road crossings make it easily accessible.