The University of Toronto (U of T) is a public research university in the city of Toronto, Ontario, Canada. It is the largest university in Canada in terms of student enrollment. The institution comprises sixteen academic faculties and a collegiate framework of eleven colleges within its principal campus St. George, which surrounds Queen's Park in the Downtown district. It is one of the most widely known and highly regarded universities in Canada and ranks highly in numerous world rankings. There are two other campuses along with the St. George campus in downtown Toronto—University of Toronto Scarborough and University of Toronto Mississauga.

The University was chartered in 1827 as King's College, the first institution of higher learning in the colony of Upper Canada. At first controlled by members of the Church of England and the colonial establishment, the university acquired its present name in 1850 upon becoming a secular institution. Since the creation of University College in 1853 as the first of its constituent colleges, the university had also incorporated the ecclesiastical schools of Trinity College, Victoria University and St. Michael's College among others into its organization.

Research at the University of Toronto has been responsible for the world's first electronic heart pacemaker, artificial larynx, single-lung transplant, nerve transplant, artificial pancreas, chemical laser, G-suit, the first practical electron microscope, the first cloning of T-cells, and the extraction of insulin.

The university is consistently placed among the leading academic institutions of the world. Newsweek places the university first in Canada, and 18th worldwide, 9th among public universities, and among the top 5 universities outside the United States. The University is also affiliated with 9 Nobel laureates (6 alumni), the most of any Canadian university.