[1] There are approximately 300 students enrolled in grades 9 through 12, making it the smallest of three High Schools located in Lindsay.

Students are required to wear a uniform purchased from R.J. McCarthy in navy blue, white, gold, and khaki pieces specific to St. Thomas Aquinas Catholic Secondary School.

The school offers classes for the workplace, college and university-bound student, as well as a Specialist High Skills Majors (SHSM) in Health/Wellness[2] and an Agriculture Specialist High Skills Major program, introduced in 2019.

St. Thomas Aquinas offers a variety of male and female sports, including: St. Thomas Aquinas has professional and community partnerships for SHSM students:[4][5][6] The Ontario Youth Apprenticeship Program consists of a unique combination of Community College Trades Training and a Secondary School Cooperative Education Program.

By the end of the semester, they can earn their Basic - Level One Trade Qualifications in that program.