South Heart is a city in Stark County, North Dakota, United States. The population was 394 at the 2020 census. It is part of the Dickinson Micropolitan Statistical Area. South Heart was founded in 1908.

Stark County is a county in the U.S. state of North Dakota. As of the 2020 census, the population was 33,646, making it the 7th most populous county in North Dakota. Its county seat is Dickinson.