| Hartbach | |
| Name Other: | Reichersberger Bach |
| Mouth Coordinates: | 48.34°N 13.3602°W |
| Mouth Location: | Inn |
| Subdivision Type1: | Country |
| Subdivision Name1: | Austria |
| Subdivision Type2: | State |
| Length: | 22.4km (13.9miles) |
The Hartbach (also called Reichersberger Bach) is a river of Upper Austria, a small, right tributary of the Inn.
The Hartbach originates in the Senftenbach area. It flows from south to north to the Inn and merges with it east of Obernberg am Inn.