South Sioux City
- Country: United States
- State: Nebraska
- Population: 13,120 (2016)
- Latitude: 42° 28.4' N (42.47388°)
- Longitude: 96° 24.8' W (-96.41364°)
- Elevation: 335 m/1,100 ft. above sea level
- Time zone: America/Chicago (UTC -06:00); DST observed (UTC -05:00)