Columbia High School is a four-year comprehensive regional public high school in Maplewood, in Essex County, New Jersey, United States. It serves students in ninth through twelfth grades, as the lone secondary school of the South Orange-Maplewood School District, which includes Maplewood and South Orange, neighboring communities in Essex County, New Jersey, United States. The school has been accredited by the Middle States Association of Colleges and Schools Commissions on Elementary and Secondary Schools since 1928; its accreditation expires in December 2023.