Warrington is an unincorporated community located within Knowlton Township in Warren County, in the U.S. state of New Jersey.

[1][2] It is located on the Paulins Kill, approximately 1 mi (1.6 km) northeast of where it flows into the Delaware River.

[3][5] A line of the Delaware, Lackawanna and Western Railroad—now abandoned—passed through Warrington.

[3] The Warrington Stone Bridge is located north of the settlement.

Built around 1860, it is still the largest stone arch roadway bridge in New Jersey, and is listed on both the New Jersey Register of Historic Places and National Register of Historic Places.