The Delaware River Port Authority (DRPA), officially the Delaware River Port Authority of Pennsylvania and New Jersey, is a bi-state agency instrumentality created by a congressionally approved interstate compact between the state governments of Pennsylvania and New Jersey. The authority is principally charged to maintain and develop transportation links between the two states with four bridges and a mass transit rail line across the Delaware River. Though the DRPA has "port" in its name, it does not own or operate any ports.

The Delaware River is a major river in the Mid-Atlantic region of the United States and is the longest free-flowing (undammed) river in the Eastern United States. From the meeting of its branches in Hancock, New York, the river flows for 282 miles (454 km) along the borders of New York, Pennsylvania, New Jersey, and Delaware, before emptying into Delaware Bay.