TransAdelaide was a publicly owned cooperation in Adelaide, South Australia, and operated the city's suburban rail, tram and bus services.

The formation of TransAdelaide was a prelude to competitive tendering and the introduction of private operators into the Adelaide public transport network.

It was abolished in August 2010, with its staff and functions transferred to the newly created Office of the Rail Commissioner.

In the 21st century, a series of investments were made to improve and extend the line, beginning in May 2003 when the South Australian Government announced an upgrade of the Glenelg line infrastructure and the introduction of new trams.

Concrete sleepers were installed and much of the track renewed in an intensive nine-week project.

The overhead electrical supply was upgraded, and some minor modifications were made to the Type H trams and Glengowrie depot.