St. Francis Xavier Secondary School is a Catholic high school in Mississauga, Ontario, Canada, overseen by the Dufferin-Peel Catholic District School Board. It has 1929 students, about 130 teaching and support staff, and a childcare centre. The school mascot is the Tiger. The school has an International Baccalaureate (IB) diploma program and Specialist High Skills Major programs for Hospitality, Health & Wellness, and Sports. The school is located in St. Francis Xavier Parish in the Archdiocese of Toronto.