| Gsieser Bach | |
| Mouth Location: | Welsberg |
| Mouth Coordinates: | 46.7597°N 12.0982°W |
| Subdivision Type1: | Country |
| Length Km: | 22.3 |
| Mouth Elevation: | 1071m (3,514feet) |
| Basin Size Km2: | 145 |
The Gsieser Bach (it|Rio Casies pronounced as /it/) is a stream in South Tyrol, Italy. It flows into the Rienz in Welsberg.