The Rail Tram & Bus Union is one of Australia’s major industry-based unions, able to cover all employees in the rail, tram and bus industries. It is organised into National Divisions, covering infrastructure (Perway), Rail Operations, Tram and Bus, Locomotive, Workshops and Administrative, Supervisory and Technical.

The RTBU was formed on 1st March 1993, through an historic amalgamation of three railway unions and one tram and bus union. The RTBU is the workers response to a decade of massive change in public transport, often motivated by anti-union and privatisation ideology.