South Billings is an unorganized territory in Billings County, North Dakota, United States. The population was 258 at the 2020 census.
South Billings has a total area of , of which is land and is water.
It surrounds the city of Medora, and contains the unincorporated communities of Fryburg and Sully Springs.
As of the 2023 American Community Survey, there were an estimated 93 households with a margin of error of 30.