South Heart
- County:
- Stark County
- County Seat:
- No
- Area (mi²):
- 1.347
- State:
- North Dakota
South Heart is a city located in Stark County, North Dakota. South Heart has a 2026 population of 414. South Heart is currently growing at a rate of 2.73% annually and its population has increased by 4.28% since the most recent census, which recorded a population of 397 in 2020.