| Rabnitzbach | |
| Other Name: | Rabnitz |
| Source1 Location: | near mount Schöckl |
| Mouth Location: | Rába near Gleisdorf |
| Mouth Coordinates: | 47.0971°N 15.7008°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Austria |
| Subdivision Type2: | State |
| Subdivision Name2: | Styria |
| Length: | 28.3km (17.6miles) |
The Rabnitzbach (also Rabnitz) is a river of Styria, Austria, one of the source rivers of the Rába (Raab).
The Rabnitzbach originates near mount Schöckl and flows in south-east direction to Gleisdorf where it merges with the Rába. The river reaches a length of . Its basin area is .[1]
The water has Grade A quality and is one cleaner waters of Styria. It is rich on fishes. The normally harmless river can very quickly become a flood hazard and has already been a threat several times. Dangerous points have been mitigated without causing significant damage to nature.