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.

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.