South Labuhanbatu Regency (Kabupaten Labuhanbatu Selatan, alternatively Kabupaten Labuhan Batu Selatan) is a regency of North Sumatra Province of Indonesia, created on 21 July 2008 (in accordance with Law No.

22 of 24 June 2008) by being carved out of the southern districts of the existing Labuhanbatu Regency.

The new South Labuhanbatu Regency covers an area of 3,596 square kilometres and according to the 2010 census it had a population of 277,673,[2] which rose to 314,094 at the 2020 Census;[3] the official estimate as at mid 2023 was 330,797 (comprising 168,655 males and 162,142 females).

The regency is divided administratively into five districts (kecamatan), tabulated below with their areas and their populations at the 2010 Census[2] and the 2020 Census,[3] together with the official estimates as at mid 2023.

[1] The table also includes the location of the district centres, the number of administrative villages in each district (totaling 52 rural desa and 2 urban kelurahan), and its post code.