In 1993, MGCI was honoured with the Roberta Bondar Science and Technology Award in recognition of the school's achievements in numerous student programs, particularly its Students for the Exploration and Development of Space chapter, which no longer exists.

On December 31, 1997, the EYBE was dissolved and Marc Garneau Collegiate became part of the new Toronto District School Board the following day.

Garneau provides students with a wide variety of sports teams including: Football, Rugby, Basketball, Soccer, Volleyball, Baseball, Field Hockey, Ultimate Frisbee, Cricket, Tennis, and an annual ball hockey tournament.

Drama students at Marc Garneau perform musicals and plays, and participate in many activities, such as the Canadian Improv Games and the Sears Festival.

[5] MGCI also frequently places in the top 3 in various University of Waterloo math contests.