| Cow Yard Brook | |
| Map: | Cow Yard Brook.JPG |
| Source1 Coordinates: | 40.4119°N -74.5356°W |
| Mouth Coordinates: | 40.4128°N -74.5142°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Progression: | Oakeys Brook, Lawrence Brook, Raritan River, Atlantic Ocean |
| Mouth Elevation: | 98feet |
The Cow Yard Brook is a small tributary of the Oakeys Brook, in central South Brunswick, New Jersey in the United States.
The Cow Yard Brook starts at 40.4119°N -74.5356°W[1] near the intersection of Beekman Road, Northumberland Way, and US Route 1. It crosses Deans Lane near its intersection with Black Horse Lane. It then crosses Black Horse Lane and drains into the Oakeys Brook at 40.4128°N -74.5142°W,[1] near the intersection of Black Horse Lane and Henderson Road.
The Cow Yard Brook is very short, but it can be accessed by some of the roads it crosses and the Oakeys Brook.