Harrison High School is a four-year comprehensive public high school serving students in ninth through twelfth grades, located in Harrison, in the U.S. state of New Jersey, operating as the lone secondary school of the Harrison Public Schools. Students from East Newark attend Harrison High School as part of a sending/receiving relationship with the East Newark School District, though the East Newark district has sought to switch to sending students to Kearny High School, citing potential cost savings.

As of the 2024–25 school year, the school had an enrollment of 795 students and 50.0 classroom teachers (on an FTE basis), for a student–teacher ratio of 15.9:1. There were 594 students (74.7% of enrollment) eligible for free lunch and 122 (15.3% of students) eligible for reduced-cost lunch.