Northern Valley Regional High School at Demarest is a comprehensive four-year public high school serving students from several municipalities in Bergen County, New Jersey, United States. The high school serves students from the suburban communities of Closter, Demarest, and Haworth. The school is one of two high schools that are part of the Northern Valley Regional High School District, the other being Northern Valley Regional High School at Old Tappan, which serves students from Harrington Park, Northvale, Norwood, and Old Tappan, along with students from Rockleigh, who attend as part of a sending/receiving relationship.