The Ilz (German: [ɪlt͡s] ⓘ) is a river running through the Bavarian Forest, Germany.

During its 40 km (25 mi) length (69 km (43 mi), including its main source river Große Ohe), it travels down a height difference of ~140m.

The Ilz is formed at the confluence of its source rivers Große Ohe and Kleine Ohe in Eberhardsreuth.

In the city of Passau it finally enters the Danube.

This article related to a river in Bavaria is a stub.