| Port Mercer, New Jersey | |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | USA New Jersey Mercer County#USA New Jersey#USA |
| Pushpin Label: | Port Mercer |
| Pushpin Label Position: | left |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Mercer |
| Subdivision Type3: | Township |
| Subdivision Name3: | Lawrence, Princeton and West Windsor |
| Elevation Ft: | 56 |
| Coordinates: | 40.3042°N -74.685°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 879438 |
| Unit Pref: | imperial |
Port Mercer is an unincorporated community located where the municipal boundaries of Lawrence Township, Princeton and West Windsor Township intersect in Mercer County, in the U.S. state of New Jersey.[1] It is the location of the historic Port Mercer Canal House along the Delaware and Raritan Canal.
Port mercer developed starting in the 1830s with the construction of the Delaware & Raritan Canal. It represents one of West Windsor's historic hamlets, and several mid-1800s residences still populate the community. The hamlet thrived from the 1830s until the mid-late 1800s, when the current Northeast Corridor rail line relocated from next to the canal to its current position.[2]
In October 2019, the Historical Society of West Windsor published an online museum exploring the history of West Windsor - including Port Mercer.