The Voglajna (pronounced [ʋɔˈɡlaːi̯na]) is a river in Styria, Slovenia. The river is 35 kilometres (22 mi) long (including its source river, the Ločnica), and its catchment area is 412 km² (159 sq mi).^[1] 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.

• List of rivers of Slovenia

• Condition of Voglajna - graphs, in the following order, of water level, flow and temperature data for the past 30 days (taken in Črnolica by ARSO)