Sleaford is a locality in the Australian state of South Australia located at the southern tip of the Eyre Peninsula overlooking the Great Australian Bight about 260 kilometres (160 miles) west of the state capital of Adelaide and about 17 kilometres (11 miles) west of the municipal seat of Port Lincoln.

[3][9] The boundaries of the locality were created in October 2003 for the “long established name” which is derived from Sleaford Bay.

[1][10] Sleaford consists of land at the southern tip of Eyre Peninsula located south of a line running west from the western end of Proper Bay within the natural harbour known as Port Lincoln, and which is bounded from the west to the south-east by the coastline overlooking the Great Australian Bight including the western half of Sleaford Bay and whose eastern boundary is located in the western part of the Jussieu Peninsula.

[8][12] Land use within the locality consists of land zoned for both agricultural and conservation purposes including the following protected areas - the part of the Lincoln National Park located within the Hundred of Sleaford and the Sleaford Mere Conservation Park.

[14] The 2016 Australian census which was conducted in August 2016 reported that Sleaford had a population of 46 people.