Brampton Transit (BT) is a public transport bus operator for the City of Brampton in the Regional Municipality of Peel, and within the Greater Toronto Area (GTA) in Ontario, Canada. Brampton Transit began operations in 1974. In 2024, the system had a ridership of 49,200,800, or about 226,500 per weekday as of the second quarter of 2025.

Züm, a series of bus rapid transit routes running along various major roads within Brampton, was introduced in 2010. All Züm routes (with the exception of one) continue into neighbouring municipalities, namely Mississauga, Vaughan, and Toronto (Humber College Bus Terminal).

Brampton Transit is connected with Mississauga's MiWay to the south, Milton Transit to the west, Toronto Transit Commission (TTC) to the southeast and York Region Transit (YRT) to the east. The Züm network directly connects to these neighbouring transit agencies, in some cases overlapping with their routes for considerable distances. This includes the 501 Züm Queen in Vaughan running alongside Viva Orange from Highway 50 east to Vaughan Metropolitan Centre subway station, 502 Züm Main running alongside 103 Hurontario Express from Highway 407 south to Mississauga City Centre Transit Terminal (next to Square One Shopping Centre) and 505 Züm Bovaird (both into Mississauga) running alongside MiWay and TTC routes to Toronto Pearson Viscount Station or into Toronto.

Most major north-south conventional routes connect to MiWay, primarily beginning or ending their route at or near Derry Road in Mississauga. As with some routes on the Züm network, a few conventional routes also overlap further south into Mississauga providing additional or integrated service alongside MiWay from the same street coming from Brampton. Examples include the 7/7A Kennedy looping via Courtneypark Drive, 30 Airport Rd and 14 Torbram terminating at Westwood Square, and 18 Dixie looping via Courtneypark Drive, Tomken Road, and Meyerside Drive.

Steeles Avenue is a major thoroughfare across the south end of the city. Route 11 Steeles runs from west of Brampton Gateway at Hurontario Street, and eastward into Toronto to Humber College Bus Terminal at Humber College's North Campus. There is a transfer at the college with Route 50/50A Gore Road, that serves developments in The Gore Road area near the former Highway 50 and Albion Road. In September 2007, the western part of the route was cut back to Brampton Gateway and replaced with Route 51 Hereford. However in March 2025, the 11 Steeles got a massive service improvement on the section between Lisgar GO and the Brampton Gateway Terminal, with all day frequencies of at least 30-35 min on weekdays, and 40-45 mins on weekends. It connects with Miway at Mississauga Road and Meadowvale Boulevard. The 511 Züm Steeles route serves the entire length of Steeles through the city, from Humber College Bus Terminal to Lisgar GO station in Mississauga. It is the only Brampton Transit route to have both its endpoints outside Brampton.

Four routes run north into Caledon to provide service to urbanized areas bordering Brampton as well as the community of Bolton in the otherwise rural municipality.

Brampton Transit carries riders to and from the three Kitchener line commuter rail stations operated by GO Transit in the city; Bramalea, Brampton, and Mount Pleasant, where connections to GO buses can be made. GO buses also make an on-street connections at Brampton Gateway Terminal, and serves shopping centres such as Bramalea City Centre and Trinity Common. GO is an interregional agency that provides higher-order transit links Brampton to Toronto and other cities in the Golden Horseshoe.

Fares are as of May 10, 2023. The cash fare is $4.50.