Joliet
- Country: United States
- State: Illinois
- Population: 148,262 (2016)
- Latitude: 41° 31.5' N (41.52503°)
- Longitude: 88° 4.9' W (-88.08173°)
- Elevation: 165 m/541 ft. above sea level
- Time zone: America/Chicago (UTC -06:00); DST observed (UTC -05:00)
- Alternate names: Juliet