Chelmsford High School is a public, coeducational high school founded in 1917. The current building is located in North Chelmsford, Massachusetts, United States, and was built in 1974. Before 1974 the high school was located in the current McCarthy Middle School building. It serves as the public high school for students in grades nine through 12 and has been ranked among the top 500 schools in the nation by Newsweek.

Billerica Memorial High School (BMHS), formerly Howe High School, is a public secondary school in the town of Billerica, Massachusetts. It is the only high school under the purview of the Billerica Public Schools district, and serves approximately 1,600 students between grades 8 and 12. The school is supervised by a district superintendent who reports to an elected school committee for the town. As of January 2023, Thomas Murphy, an alumnus of BMHS, is the school's principal. The administration consists of assistant principals responsible for a specific grade-year. In athletics, Billerica's arch-rival is Chelmsford High School. The colors of BMHS are green and white, and the school's emblem is the Indian Head.