Beaconsfield High School (commonly referred to as Beaconsfield High or BHS) is a secondary school located in the Montreal area suburb of Beaconsfield, Quebec, Canada. Beaconsfield High is part of The Lester B. Pearson School Board. Previously, it was considered to be the flagship high school of the now defunct Lakeshore School Board.

First opened in 1958, and renovated and expanded in the 1970s adding a second gymnasium, theatre, and a new cafeteria, library and two new wings, Beaconsfield High School is currently home to more than 600 students. According to the school's website, BHS has "traditionally served the communities of Beaconsfield, Baie d'Urfe, Kirkland and Pointe-Claire. Students from the communities of Ste. Anne de Bellevue, Ile Perrot and Pincourt are now increasingly part of the school population. A high proportion of graduating students goes on to attend CEGEP."

Beaconsfield High School also offers strong academic French immersion and regular English programs at all levels, as well as an alternative program known as Embarkations, which is renowned for its successes with disenfranchised youth that started in 1992. Augmenting these course offerings are a wide range of special programs covering visual arts, drama, dance, music, physical education, and computer technology. Beaconsfield High School gives students access to a large variety of sports and e-sports. The school also offers many different after-school clubs including but not limited to the "Dungeons and Dragons" club, the math club, and the manga club.

• Mark Montreuil, former NFL defensive back for the San Diego Chargers