North Mahanoy Creek is a tributary of Mahanoy Creek in Schuylkill County, Pennsylvania, in the United States. It is approximately 4.4 miles (7.1 km) long and flows through Delano Township, Mahanoy Township, and Mahanoy City. The watershed of the creek has an area of 5.99 square miles (15.5 km2). The creek is designated as an impaired waterbody due to sedimentation/siltation and water/flow variation from abandoned mine drainage. The creek is relatively small, an ephemeral stream in its lower reaches, and is located within the Western Middle Anthracite Field.