| Aschach | |
| Mouth Location: | Innbach |
| Mouth Coordinates: | 48.3053°N 14.0994°W |
| Progression: | Innbach→ |
| Subdivision Type1: | Country |
| Subdivision Name1: | Austria |
| Subdivision Type2: | State |
| Subdivision Name2: | Upper Austria |
| Length Km: | 35.3 |
The Aschach is a river of Upper Austria. It is a left tributary of the Innbach near Alkoven.