| Pleasant Run | |
| Name Other: | Campbell's Brook |
| Name Etymology: | Descriptive Etymology |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New Jersey |
| Subdivision Type3: | Region |
| Subdivision Name3: | Raritan Valley |
| Subdivision Type5: | City |
| Subdivision Name5: | Readington, Branchburg |
| Length: | 7miles |
| Source1: | Cushetunk Mountain |
| Source1 Location: | Readington, Raritan Valley, New Jersey, United States |
| Source1 Coordinates: | 40.5337°N -74.8182°W |
| Source1 Elevation: | 312feet |
| Mouth: | South Branch Raritan River |
| Mouth Location: | Branchburg, Raritan Valley, New Jersey, United States |
| Mouth Coordinates: | 40.518°N -74.7291°W |
| Mouth Elevation: | 75feet |
Pleasant Run is a tributary of the South Branch Raritan River in central New Jersey in the United States.
Pleasant Run is approximately in length,[1] running from its headwaters near Cushetunk Mountain,[2] a plutonic intrusion of igneous rock surrounding Round Valley Reservoir, through Readington and Branchburg, to its convergence with the South Branch Raritan River near River Road in Branchburg.
Pleasant Run was originally called Campbell's Brook after John Campbell of Piscataway. Campbell in 1685, was granted a strip of land extending west from the South Branch and which surrounded Pleasant Run.[3]
Pleasant Run has twenty-three small, unnamed tributaries in Branchburg and Readington.