Southbury
- Country: United States
- State: Connecticut
- Population: 19,727 (2016)
- Latitude: 41° 28.9' N (41.481°)
- Longitude: 73° 12.8' W (-73.214°)
- Elevation: 75 m/245 ft. above sea level
- Time zone: America/New_York (UTC -05:00); DST observed (UTC -04:00)