The Toronto Transit Commission (TTC) is a public transport authority that operates buses, streetcars, subways, and rapid transit lines in Toronto, Ontario, Canada. The TTC operates 149 surface transit routes, of which 148 routes make 243 connections with a subway or rapid transit station during weekday rush hours. In 2007, the TTC carried 459,769,000 passengers, 3,229,000 passengers daily (2,033,000 revenue passengers in 2006). The TTC employed 10,930 personnel in 2006.

The TTC operates the third most heavily-used urban mass transit system in North America (after the New York City Transit Authority and the Mexico City Metro). As of 2007, there are three subway lines and one elevated rapid transit line (see Toronto subway and RT) with a total of 69 stations, as well as 149 connecting "surface" routes (buses and streetcars). The average daily ridership exceeds 2.46 million passengers: 1,197,000 through bus, 328,700 by streetcar, 35,300 by intermediate rail, and 901,400 by subway. The TTC also provides door-to-door services for persons with physical disabilities known as Wheel-Trans. An approximate 4,500 trips are made through this service daily. Colloquially, the subway cars were known as "red rockets" (nickname originally given to Gloucester Subway cars painted bright red - now retired); hence the use of "Ride the Rocket" in advertising material for the TTC (which uses the phrase to advertise the entire system), and the use of the word "Rocket" in the names of some express buses. The entire system is also promoted as "The Better Way".