| Southern Regnitz | |
| Subdivision Type1: | Countries |
| Mouth Coordinates: | 50.2964°N 11.9347°W |
| Length: | 33.8km (21miles) |
| Basin Size: | 115km2 |
The Southern Regnitz (German: Südliche Regnitz, Czech: Rokytnice) is a river of Czech Republic and Germany. The source of the 33.8 km long river is near the village of Hranice, in Cheb District. It forms the border of Germany with the Czech Republic in the extreme northeast of Bavaria and then runs into Bavaria to join the Saale river near the city of Hof.