St. Thomas Aquinas Catholic Secondary School is a high school located in the western part of Old Oakville in Oakville, Ontario. St. Thomas Aquinas is a member of the Halton Catholic District School Board. There are over 1600 students attending the school in grades 9 through 12. At St. Thomas Aquinas, the current principal is Mr. Paul Di Ianni and the vice-principals are Mr. Adriano Perusin, Mr. Gord McCarles, and Mrs. Maria Thomas. The previous principal of St. Thomas Aquinas was Mr.