Holland Brook is a tributary of the South Branch Raritan River in Hunterdon and Somerset Counties, New Jersey in the United States.

The brook is over seven miles in length running from its headwaters near Cushetunk Mountain,[1] a plutonic intrusion of igneous rock surrounding Round Valley Reservoir, to its convergence with the South Branch Raritan River near Studdiford Drive in Branchburg.

Branchburg’s proposed section of the Greenway would fit into a larger plan and would connect with a 16-mile cross-township trail.

The township of Branchburg would need to gain four additional properties to have public access from the Readington border to the Confluence Reservoir Park land along the North Branch Raritan River.

[5] Holland Brook has ten unnamed tributaries in Branchburg and Readington listed on NJDEP's website.