Thalheim bei Wels is a town in the Wels-Land District in the Austrian state of Upper Austria.
It is situated on the right bank of the river Traun, opposite the city of Wels. About 11.6% of the municipality is forest, 69% is farmland.
In June 2025, archaeologists from OÃÂâ¯LandesâÂÂKulturâ¯GmbH and the University of Salzburg uncovered a Roman villa complex on Reinberg Hill in Thalheim bei Wels. The site spans over 1,000â¯mò and includes three well-preserved mosaic floors dating to the 2nd centuryâ¯CE. The most notable mosaic features an aquatic scene with two dolphins, an exceptionally rare find in Upper Austria. Another mosaic depicts a wineâÂÂmixing vessel (krater), while a third, partially excavated, displays geometric patterns. The villa overlooks the ancient Roman town of Ovilava (modern Wels).