North Warren Regional High School is a public high school and regional school district, located in Warren County, New Jersey, United States, that serves students in seventh grade through twelfth grade from the four constituent townships of Blairstown (where the school is located), Frelinghuysen, Hardwick and Knowlton. The school opened in September 1970, replacing the former Blairstown High School. The school has been accredited by the Middle States Association of Colleges and Schools Commission on Elementary and Secondary Schools since 1984.