The Katschberg Tunnel, opened for motor traffic in 1974, is a border tunnel on the Tauern Motorway in southern Austria. It connects the regions of Salzburg (south of Oberweißburg, Unterweißburg, and Höf) and Carinthia (north of Saraberg and Mühlbach) and is located on the A10 motorway.
In December 2004, construction began on a second tunnel tube, which was completed in April 2008 and opened for traffic.
The western tube is 5,565 meters (5.5 km) long, and the eastern tube is 5,898 meters (5.8 km) long.
The Katschberg Tunnel is a special toll section and is therefore exempt from the vignette requirement.