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, and came to be known as MTCSS (or simply BMT) among staff, students, and alumni.

Another school was built later, and that received the name Mary Ward Catholic Secondary School.

The ideals of the school's patroness and namesake, Mother Teresa, became 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.

54 Ethnic monorities are represented in its student population, reflecting the diverse Malvern community that the school serves.

BMT stands at the corner of Sewells Road and McLevin Road, off Neilson Road between Sheppard Avenue East and Finch Avenue East. It is beside the Malvern Community and Recreational Centre, which also houses the Malvern Branch of the Toronto Public Library.

Courses taught at the school follow the Ontario Curriculum for Grades 9 through 12. Some subjects being taught at the school include:

Coordinates: 43°48′31″N 79°12′59″W / 43.808720°N 79.216404°W / 43.808720; -79.216404