| Oberach | |
| Mouth Location: | Antiesen |
| Mouth Coordinates: | 48.2311°N 13.4696°W |
| Progression: | Antiesen→ |
| Subdivision Type1: | Country |
| Subdivision Name1: | Austria |
| Subdivision Type2: | State |
| Subdivision Name2: | Upper Austria |
| Length: | 18.2km (11.3miles) |
Oberach is a river in the Innviertel of the Austrian state of Upper Austria. It is a tributary of the Antiesen.[1] Its source is in the municipality of Pramet. Below its confluence with the Breitsach in Ried im Innkreis, it is also called German: Rieder Bach.[1] [2]