Marlboro High School is a four-year comprehensive public high school located in Marlboro Township, in Monmouth County, New Jersey, United States, serving students in ninth through twelfth grades as one of the six secondary schools of the Freehold Regional High School District (FRHSD). The school serves students from portions of Marlboro Township. In addition, Marlboro High School hosts the Business Administration Learning Center within FRHSD, so there are students attending Marlboro High School from throughout Monmouth County.