Ebensee is a market town in the Traunviertel region of the Austrian state of Upper Austria, located within the Salzkammergut Mountains at the southern end of the Traunsee. The regional capital Linz lies approximately 90 km (56 mi) to the north, nearest towns are Gmunden and Bad Ischl. The municipality also comprises the Katastralgemeinden of Langwies, Oberlangbath, Rindbach, Kohlstatt and Roith.
In 1943, the SS established Ebensee concentration camp (codename "Zement") near the town, a planned emergency location for the Peenemünde research centre after the RAF Operation Hydra attack. It was part of the Mauthausen network. Slave laborers were worked to death digging tunnels for armaments storage. The camp was liberated by American soldiers in May 1945. Due to the extremely high death rates, Ebensee is considered one of the most horrific Nazi concentration camps.