The University of Toronto St. George (U of T St. George or UTSG), otherwise known as the St. George campus, is the University of Toronto's main campus in downtown Toronto, Ontario, Canada. Set on the historic grounds that surround Queen's Park, it is the oldest of the university's three campuses. The founding of University College, the university's first non-secular college, marked the beginning of the University of Toronto as it stands today; its main building opened on October 4, 1859, and the grounds have since grown to encompass a large area spanning multiple city blocks which comprise the University neighbourhood.
The St. George campus is the largest of the University of Toronto's three campuses in terms of student enrolment, the other two of which are the Mississauga and the Scarborough campuses, and the largest university campus in Canada. St. George is home to the university's central administration and the majority of its academic faculties, Varsity Blues athletic programs, and professional and graduate studies programs. It is the location of the university's college system, comprising 11 distinct constituent and federated colleges, each with their own character, history and varying degrees of autonomy.