| Pfreimd | |
| Name Other: | Katharinabach |
| Subdivision Type1: | Countries |
| Mouth Coordinates: | 49.4991°N 12.1772°W |
| Length: | 76.5km (47.5miles) |
| Basin Size: | 595km2 |
Pfreimd (in its upper course: Katharinabach, Czech: Kateřinský potok) is a river of Plzeň Region, Czech Republic and Bavaria, Germany. It flows into the Naab in the town Pfreimd.