Masco plays in the
Northeastern Conference. The school's colors are Alizarin Crimson & Eggshell. In 2017, the football team had the opportunity to play against
Everett High School in
Fenway Park the day before Thanksgiving. The baseball team earned the Division II Massachusetts State Championship in 2000 by defeating
Drury 7–2. They defeated the 22–0
Danvers squad in the second round,
North Andover, and then
Westford Academy to capture the North Section. They defeated
Franklin in walk-off fashion after 8 innings in the state semi-final on their way to earning the first title in school baseball history. In a 2012 lacrosse game against
Boston College High School, senior Jake Gillespie scored a record-tying 9 goals. Gillespie now plays lacrosse for the Jumbos of
Tufts University. The boys' hockey team earned a Co-Cape Ann League title with
Wilmington in the 2008–09 season, with an overall record of 14–5–2. Then again in 2013–14 season, with
North Reading and an overall record of 15–5–2. Masconomet added girls' hockey to its varsity program in 2000, with its inaugural game being played December 15, 2000 at Johnson Rink at Pingree. In the 2013–14 school year, Masconomet won state titles in Boys' Soccer (over
Walpole, 5–3) and Baseball (10–2 over
Westwood). Also, the Ultimate club team won the Massachusetts state title and Northeast Regionals in Maine. In the fall of the 2015–16 school year, Masconomet won the Division 2 North Final in Boys' Soccer (over
Concord-Carlisle, 2–1). In a December 8, 2019, game against the
New England Patriots, the
Kansas City Chiefs’ equipment was accidentally delivered to New Jersey. A backup plan was apparently set for the Chiefs to use Masconomet helmets. For the 2019–20 season, the boys Swim and Dive team went undefeated throughout the CAL dual meet season and the CAL Championship Meet at the end of the season. ==Notable alumni==