The Bremer River, part of the lower Murray-Darling catchment, is a river that is located in the Adelaide Hills region in the Australian state of South Australia.

The Bremer River rises on the eastern side of the Mount Lofty Ranges at an altitude of 431 metres (1,414 ft) AHD[2] south of Mount Torrens and flows generally south, joined by the Mount Barker Creek and Dawesley Creek, before emptying into Lake Alexandrina at the lower end of the Murray-Darling basin.

Towns on the Bremer River itself include Harrogate, Callington and Langhorne Creek, where the floodwaters are used to irrigate the local vineyards.

One recorded Aboriginal name for the Bremer River was Miochi.

This led to the following proclamation by the second Governor, George Gawler, appearing in the South Australian Gazette, effective 26 June 1839, ‘His Excellency the Governor having observed that to the southward [of Adelaide] there are two rivers named ‘The Hindmarsh’ – one flowing into Encounter Bay, and the other into Lake Alexandrina – is pleased to direct that the latter river shall in future be named the ‘River Bremer’, in the public maps, in order to avoid confusion in the geographical description of the province.’[5] The man so honoured by the renaming was the distinguished British Royal Navy officer Gordon Bremer, who happened to command HMS Alligator, which conveyed Hindmarsh back to England.