École secondaire Marguerite-De Lajemmerais is a Francophone secondary public mixed school located in Rosemont-La Petite-Patrie borough in Montreal, Quebec.

[3] The establishment constructed in 1964 has three to six stories in a long straight shape in « I » connected with 4 irregular and asymmetric aisles.

The building has mainly light yellow, red and brown bricks with lots of windows in a modernist and functionalist style.

It contains mainly regular classrooms, rooms for computer labs, science labs, plastic art workshops, a music room, two cafeterias, a library, two gymnasiums, an auditorium and used to have a swimming pool that is now a new gymnasium.

The school also comprises outdoor facilities such as a running track, a small soccer field and two tennis courts.