St. Francis Xavier Secondary School (Mississauga)

St. Francis Xavier Secondary School, colloquially abbreviated as FX, is a Catholic high school in Mississauga, Ontario, Canada, overseen by the Dufferin-Peel Catholic District School Board. As of October 29, 2021, it has 1,840 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 Health & wellness, Hospitality & Tourism, and Transportation.

The school is located in St. Francis Xavier Parish in the Archdiocese of Toronto. The school catchment includes graduates of St. Hilary, St. Matthew, St. Jude, San Lorenzo Ruiz Elementary schools, St. Valentine students living east of Mavis Rd. and is the most common high school for graduates of Fairwind Senior Public School and Bristol Road Middle School, even though they are in the Peel District School Board.