The three-story Marlboro Middle School was opened in September 1976. It is located on a 47-acre tract on County Road 520. Architect Jules Gregory planned the 146,000 square foot building as three separate wings designed to be independent of one another. At that time, all of the district’s seventh and eighth graders were housed in the building, and in 1998 an addition was built. With the opening of Marlboro Memorial Middle School in March 2003, both middle schools now house all of the district’s sixth, seventh, and eighth grade students.
The school's mascot, the Marlboro Hawk, was selected in 1966 by a student survey at Central School, which was where seventh and eighth grade students attended school prior to the opening of the Marlboro Middle School. When students from Central School moved to the new building in 1976, the Hawk came with them.