In its conception, a new school in the Scarborough area of Toronto was to be named Mary Ward. Then trustee Harold Adams advocated for the new school to be named Mother Teresa Catholic Secondary School.
The ideals of the school's patroness and namesake, Mother Teresa, became the inspiration for the school's motto.
The school, established in 1985, started out in portables and port-o-pacs. In 1989, under the direction of former principal George Iantorno, the school population of 650 students moved to the newly-built facility that stands today.