The Ščavnica (pronounced [ˈʃtʃaːu̯nitsa]; German: Stainz) is a 56 km river in Styria, Slovenia. It sources near Zgornja Velka and flows along the Slovene Hills towards the southeast. It passes Negova Castle and Sveti Jurij ob Ščavnici, traverses Lake Gajševci (Slovene: Gajševsko jezero) and the town of Ljutomer, and finally joins the Mur from the right in Razkrižje.
The Ščavnica is one of the most heavily polluted rivers in Slovenia.
- "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 Ščavnica - graphs, in the following order, of water level, flow and temperature data for the past 30 days (taken in Pristava by ARSO)