Montclair High School is a comprehensive four-year public high school located in Montclair, in Essex County, in the U.S. state of New Jersey, serving students in ninth through twelfth grades as the lone secondary school of the Montclair Public School District. The school has been accredited by the Middle States Association of Colleges and Schools Commission on Elementary and Secondary Schools since 1928.

Montclair is a township in Essex County in the U.S. state of New Jersey. Situated on the cliffs of the Watchung Mountains, Montclair is a commercial and cultural hub of North Jersey and a diverse bedroom community of New York City within the New York metropolitan area. The township is the home of Montclair State University, the state's second-largest university.