St. Thomas Aquinas or STA is a Catholic secondary school in Bramalea, Brampton, Ontario. It is under Dufferin-Peel Catholic District School Board. The school's principal is Peter Petruccelli.

St. Thomas Aquinas Secondary School, one of the oldest school communities in Brampton, originally occupied a new building at 115 Glenvale Boulevard (built in the Bramalea G-section in 1975), opening for classes in September 1976 with an enrolment of 500 students and offering Grades 7-10 (by 1982 Grades 9-13 were offered). A "portapak" addition was built in the Fall of 1980 on the south side of the building, and increasing amounts of portables were also added to handle increasing enrolment over the years.

The school changed locations to its current building at 25 Corporation Dr. near Torbram in 1992, due to increasing student enrolment. The old building at 115 Glenvale became a holding school, housing the new regional school for the north region, Robert F. Hall Catholic Secondary School and eventually housing St. Marguerite d'Youville SS for a number of years. It is currently the home of Holy Name of Mary CSS.

The present 3-story, 17 acre location at 25 Corporation Dr. went through renovations to add the "new section" in 2001. The section consists of English classes and the Brian J. Dunn theatre.

In 2024, the Ontario Labour Relations Board ruled against a teacher who had refused to resume teaching at St. Thomas Aquinas following a physical altercation with a student.

St. Thomas Aquinas has an arts program consisting of drama, dance, vocals, instrumental music and visual arts. It is one of two secondary schools with an arts program under Dufferin-Peel Catholic District School Board including St. Roch Catholic Secondary School.

St. Thomas Aquinas requires all students to wear the school uniform, which consists of a red golf shirt with school emblem or a dry fit long sleeve golf shirt with the school emblem with black pants.

St. Thomas Aquinas Catholic Secondary School includes a chapel, and the chaplain is Olivia Novak. The designated parish of the school is St. Anthony of Padua Catholic Church.

The mascot of the athletics teams is Cardy The Cardinal. St. Thomas Aquinas is home to a variety of team-associated sports, including: Football, Volleyball, Basketball, Baseball, Softball, Rugby, Soccer, Badminton, and Track and field.

Facilities include:

• 130-seat theater
• Triple gymnasium
• Full weight room
• Library
• Chapel
• Cafeteria (nicknamed the "cafetorium" because of its partial auditorium) and Servery
• Dance studio
• Various classrooms specially equipped as cosmetics, science and computer labs
• Track field with soccer goals
• 3 separate parking lots (one typically for teachers only)

• Chess Club
• Debate Club
• Eco Club
• Hosa Health Sciences Club
• Robotics
• SR. Science Club

This article's list of alumni may not follow Wikipedia's verifiability policy. Please improve this article by removing names that do not have independent reliable sources showing they merit inclusion in this article AND are alumni, or by incorporating the relevant publications into the body of the article through appropriate citations. (September 2024)

• Anthony Gale, Olympic Sledge Hockey, Bronze Medalist, 2014. (Attended: 2007-2011)
• Luciano Borsato, former professional NHL hockey player (Attended: 1980-1984)
• Sean Monahan, NHL hockey player who currently plays for the Montreal Canadiens (Attended: 2008-2012)
• David J. Phillips, actor/producer in Hollywood. (Attended: 1993-1997)
• Jessie Reyez, singer/songwriter (Attended: 2004-2008)
• Alyssa Reid, singer/songwriter
• Kwasi Poku, Footballer who currently plays for Forge FC in the Canadian Premier League
• Lowell Wright, Footballer who currently plays for York United in the Canadian Premier League
• Ezequiel Carrasco, Footballer

• Education in Ontario
• List of secondary schools in Ontario

43°44′20″N 79°42′39″W / 43.73895°N 79.71077°W / 43.73895; -79.71077