| Gsieser Bach | |
|---|---|
 | |
 | |
| Location | |
| Country | Italy |
| Physical characteristics | |
| Mouth | Rienz |
• location | Welsberg |
• coordinates | 46°45′35″N 12°05′54″E / 46.7597°N 12.0982°E |
• elevation | 1,071 m (3,514 ft) |
| Length | 22.3 km (13.9 mi) |
| Basin size | 145 km2 (56 sq mi) |
| Basin features | |
| Progression | Rienz→ Eisack→ Adige→ Adriatic Sea |
The Gsieser Bach (Italian: Rio Casies [ˈriːo kaˈziːes]) is a stream in South Tyrol, Italy. It flows into the Rienz in Welsberg.