South Labuhanbatu Regency (Kabupaten Labuhanbatu Selatan, alternatively Kabupaten Labuhan Batu Selatan) is a regency of North Sumatra, Indonesia, created in 2007 by being carved out of the existing Labuhanbatu Regency The new South Labuhanbatu Regency covers an area of 3,595.9 square kilometres and according to the 2010 census it had a population of 277,673, which rose to 314,094 at the 2020 Census. Its administrative headquarters are at Kotapinang.