Hopatcong High School is a four-year comprehensive public high school serving students in ninth through twelfth grades from Hopatcong, in Sussex County, New Jersey, United States, operating as the lone secondary school of the Hopatcong Public Schools. As of the 2020–21 school year, the school had an enrollment of 499 students and 51.3 classroom teachers (on an FTE basis), for a student–teacher ratio of 9.7:1. There were 92 students (18.4% of enrollment) eligible for free lunch and 48 (9.6% of students) eligible for reduced-cost lunch.