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. According to an urban legend, the river is also home to a creature known as the Musconetcong River Mantis Man, a somewhat humanoid, somewhat insect-like creature.