Tea Tree Plaza Interchange is a bus interchange operated by Adelaide Metro in Modbury, South Australia as part of the O-Bahn Busway. It is a central public transport hub for the north eastern suburbs of Adelaide.

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.