The Ilz is a river running through the Bavarian Forest, Germany. It is a left tributary of the Danube and 65 km in length, during which it travels down a height difference of ~780m.
The Ilz has its source near the Rachel mountain. In the city of Passau it finally enters the Danube. Another town on the Ilz is Fürsteneck.
Ilz or ILZ may refer to:
- Ilz, a river in Germany
- ILZ, the IATA code for Žilina Airport
- Ilz, Styria, a town in Austria