The Musconetcong River is a 45.7-mile-long (73.5 km) tributary of the Delaware River in northwestern New Jersey in the United States. It flows through the rural mountainous country of northwestern New Jersey. The name derives from the Lenape words moschakgeu meaning "clear" and hannek meaning "stream". Part of it is a National Wild and Scenic River.

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.