| Aiterach | |
| Pushpin Map: | Germany |
| Pushpin Map Caption: | Location of mouth |
| Mouth Coordinates: | 48.9044°N 12.6448°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Bavaria |
| Length: | 39.3km (24.4miles) |
| Basin Size: | 166km2 |
The Aiterach is a river of Bavaria, Germany. It is a tributary of the Danube, flowing into it near Straubing.