St. Michael's Choir School (also known as SMCS, The Choir School, or St. Mike's Choir) is a semi-private Catholic choir school for boys from grades 3-12 in Toronto, Ontario, Canada. It is jointly operated by the Roman Catholic Archdiocese of Toronto and Pontifical Institute of Sacred Music, which manage the school's music curriculum, and the Toronto Catholic District School Board, which administers all other academic subjects, athletics programs, and extracurricular activities. The school is a member of the International Boys' Schools Coalition.