| Ill | |
| Mouth Location: | Theel |
| Mouth Coordinates: | 49.4149°N 6.9344°W |
| Progression: | Theel→ |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | States |
| Subdivision Name2: | Saarland |
Ill is a river of Saarland, Germany. It flows through Eppelborn, and discharges into the Theel near Lebach.