Paulina is an unincorporated community located in Blairstown in Warren County, in the U.S. state of New Jersey.

[1][2] Paulina is located on the Paulins Kill, approximately 1 mi (1.6 km) east of downtown Blairstown.

Around 1768, William Armstrong constructed a grist mill there, which remained for more than a century.

Rated a "significant hazard" by the New Jersey Department of Environmental Protection, the process of removing it started in December 2023.

[7] The Paulinskill Valley Trail, a 30-mile (48 km) long recreational rail trail following the former route of the New York, Susquehanna and Western Railway, passes through Paulina.