Bordertown, formerly Border Town, is a town and locality in the Australian state of South Australia located in the state’s east near the state border with Victoria about 250 kilometres (160 mi) east of the state capital of Adelaide. It is where the Dukes Highway and the railway line cross the Tatiara Creek between Adelaide and Melbourne, the capital of Victoria.

Bordertown is on the Dukes Highway and the Melbourne–Adelaide railway, the main routes by road and rail between Adelaide and Melbourne. There are several bus services daily towards each of Adelaide, Melbourne, and Mount Gambier. The Overland train stops twice a week each way. Most rail traffic is freight passing through, although the local grain silos are also served by rail. In 2012, the crossing loop at Bordertown railway station was lengthened to 1,500 metres (4,900 ft).