Buses in Adelaide are the most extensive service of the South Australian capital's public transport system, the Adelaide Metro. A large fleet of diesel, hybrid diesel-electric, and natural gas powered buses operate services which typically terminate in the city-centre or at a suburban interchange. Buses get priority on many roads and intersections, with dedicated bus lanes and 'B'-light bus only phases at many traffic lights.

Adelaide Metro is the public transport system of the Adelaide area, around the capital city of South Australia. It is an intermodal system offering an integrated network of bus, tram, and train services throughout the metropolitan area. The network has an annual patronage of 79.9 million, of which 51 million journeys are by bus, 15.6 million by train, and 9.4 million by tram. The system has evolved heavily over the past fifteen years, and patronage increased dramatically during the 2014–15 period, a 5.5 percent increase on the 2013 figures due to electrification of frequented lines.