With 91,000 students, TCDSB is one of the largest school districts in Canada, and the largest publicly funded Catholic school district in the world.īut the title of “Catholic” is not a guarantee, especially today after the Second Vatican Council, of a school teaching in accordance with the doctrine of the Church. The Toronto Catholic District School Board (TCDSB) is a Catholic school district bringing together institutions in Toronto itself and Ontario, comprising 201 schools.