| Seeache | |
| Source1 Location: | Mondsee |
| Source1 Coordinates: | 47.8039°N 13.4503°W |
| Mouth Location: | Attersee |
| Mouth Coordinates: | 47.8002°N 13.4843°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Austria |
| Subdivision Type2: | State |
| Subdivision Name2: | Upper Austria |
| Length: | 2.9km (01.8miles) |
The Seeache is a short river of Upper Austria.
The Seeache is the natural outflow of the lake Mondsee and flows after into the lake Attersee, which itself is drained by the Ager.
The rapid river is often used for rafting. The pearl fish (Rutilus meidingerii) has settled in the Seeache.