Formal education in Dundalk dates to 1888, when the Board of Education rented the basement of the St. Helena Presbyterian Church to be converted into a school. Two years later, a one-room building was erected at Willow Spring Road and Baltimore Avenue. During the spring of 1926, the present elementary school was opened. In 1930, a second unit, the combination gym and auditorium, was added to the building. Gradually, the junior high program was extended. By 1939, a complete three-year junior program was available at the elementary school.

With the population increasing, the Board of Education constructed a new junior-senior high school which opened in September of 1946. In 1956, a second unit, the auditorium and music rooms, was added. As the result of the increasingly larger school population, a new Dundalk High School was completed in 1959 and is located at 1901 Delvale Avenue.

Dundalk High School has seen many changes since its completion. In September of 1963, Patapsco High School, located on Wise Avenue, opened and added many former Dundalk students to its enrollment figures. In June of 1966, Sollers Point High School, located on Sollers Point Road, was closed to students of junior-high ages. That same September, all remaining students in Turner Station were transferred to Dundalk High School. During the summer, the old Sollers Point High was transformed into the Dundalk Regional Vocational Center, now known as the Southeastern Technical High School, which also was opened in September of 1966. Students are transported to Southeastern Technical High School from Dundalk, Patapsco, Sparrows Point, Chesapeake, and Kenwood High Schools. They attend Southeastern Technical High School for a half-day to gain knowledge in their vocational interests which will enable them to develop competitive job skills.

The newest facility to be added to Dundalk High was the open-stage auditorium, one of the most modern in the country. The Class of 1967 had the honor of being the first to use it for commencement exercises. In 1978, the ninth grade class, formerly belonging to Dundalk Junior High School, became a part of the Dundalk High School.

The establishment of Dundalk High School as a four-year institution has developed an added sense of pride in both students and faculty. The school's primary goal of scholarship, combined with concern for athletic and occupational competency, has established Dundalk High as the flagship school of the Southeastern Area.