Northern Lehigh High School is a public high school located in Slatington, Pennsylvania. It is the only high school in the Northern Lehigh School District. Students in grades 9 through 12 from Slatington, Walnutport, and Washington Township in the Lehigh Valley region of eastern Pennsylvania attend the high school. As of the 2020-21 school year, the school had an enrollment of 478 students, according to National Center for Education Statistics data.