The Division of Barker is an Australian electoral division in the south-east of South Australia. The division was established on 2 October 1903, when South Australia's original single multi-member division was split into seven single-member divisions. It is named for Collet Barker, an early explorer of the region at the mouth of the Murray River. The 63,886 km² seat currently stretches from Morgan in the north to Port MacDonnell in the south, taking in the Murray Mallee, the Riverland, the Murraylands and most of the Barossa Valley, and includes the towns of Barmera, Berri, Bordertown, Coonawarra, Keith, Kingston SE, Loxton, Lucindale, Mannum, Millicent, Mount Gambier, Murray Bridge, Naracoorte, Penola, Renmark, Robe, Tailem Bend, Waikerie, and parts of Nuriootpa and Tanunda.

The Division of South Australia was an Australian electoral division covering South Australia. The seven-member statewide seat existed from the inaugural 1901 election until the 1903 election. Each elector cast seven votes. Unlike most of the other states, South Australia had not been split into individual single-member electorates. The other exception was the five-member Division of Tasmania. The statewide seats were abolished at a redistribution conducted two months prior to the 1903 election and were subsequently replaced with single-member divisions, one per displaced member, with each elector now casting a single vote.