The Voglajna (pronounced [ʋɔˈɡlaːi̯na]) is a river in Styria, Slovenia. The river is 35 kilometres (22 mi) in length. Its source is Lake Slivnica (Slovene: 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.
Coordinates: 46°14′N 15°17′E / 46.233°N 15.283°E