Hartwell is a city in Hart County, Georgia, United States. The population was 4,188 at the 2000 census. The city is the county seat of Hart County.
Hartwell is located at 34°21′10″N 82°55′52″W / 34.35278°N 82.93111°W / 34.35278; -82.93111 (34.352738, -82.931161). It sits upon the southern border of Lake Hartwell. Lake Hartwell got its name from the city of Hartwell.
According to the United States Census Bureau, the city has a total area of 4.6 square miles (12.0 km²), all of it land. Hartwell is part of the Upland South region.