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.
- "Reke, dolge nad 25 km, in njihova padavinska območja" [Rivers longer than 25 km and their catchment areas] (in Slovenian and English). Statistical Office of the Republic of Slovenia. 2002.
- 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)