| Traun | |
| Map: | Traun (Alz).png |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Bavaria |
| Subdivision Type3: | District |
| Subdivision Name3: | Traunstein |
| Subdivision Type4: | Reference no. |
| Subdivision Name4: | DE: 1848 |
| Length: | 28.9km (18miles) (including the Weiße Traun and Fischbach 54.5 km) |
| Source1 Location: | origin: confluence of the Weiße and Rote Traun near Siegsdorf |
| Source1 Elevation: | ca. 600 m |
| Mouth Location: | near Altenmarkt an der Alz into the Alz |
| Mouth Elevation: | 487 m |
| Basin Size: | 380km2 |
| Custom Label: | References |
The Traun (pronounced as /de/) is a river in Upper Bavaria, Germany. The nearly 29 kilometer long river is formed by the confluence of the Weiße Traun (also considered its upper course) and the Rote Traun near Siegsdorf. It passes through Traunstein and Traunreut, and flows into the Alz near Altenmarkt an der Alz.