Irvington High School is a four-year comprehensive community public high school in Irvington, in Essex County, in the U.S. state of New Jersey, that serves students in ninth through twelfth grades, as the lone secondary school of the Irvington Public Schools. IHS has three main floors and a basement, with each floor holding up to 23 classrooms. A west wing of the building was erected in the 1970s. The school is accredited by the Middle States Association of Colleges and Schools Commission on Elementary and Secondary Schools.

Irvington is a township in Essex County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 61,176, an increase of 7,250 (+13.4%) from the 2010 census count of 53,926, which in turn reflected a decline of 6,769 (−11.2%) from the 60,695 counted in the 2000 census.