| Voglajna | |
| Mouth Location: | Savinja |
| Mouth Coordinates: | 46.2211°N 15.2662°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Austria, Slovenia |
| Length: | 35km (22miles) |
| Basin Size: | 412km2 |
The Voglajna (pronounced as /sl/) is a river in Styria, Slovenia. The river is long (including its source river, the Ločnica), and its catchment area is 412km2. Its source is Lake Slivnica (sl|Slivniško jezero) near Slivnica pri Celju. It passes Šentjur, the ruins of Rifnik Castle, and Štore, and then merges with the Savinja River in Celje.