Mount Barker is a city in South Australia. Located approximately 33 kilometres from the Adelaide city centre, it is home to 21,554 residents (2021). It is the seat of the District Council of Mount Barker, the largest town in the Adelaide Hills, Part of Greater Adelaide, as well as one of the fastest-growing areas in the state.

The Mount Barker District Council is a local government area, centred on the Adelaide hills town of Mount Barker, just outside the Adelaide metropolitan area in South Australia.