Bad Aussee (German: [baːt aʊ̯sˈseː]; Central Bavarian: Bod Ossee) is a town in the Austrian state of Styria, located at the confluence of the three sources of the Traun River in the Ausseerland region. Bad Aussee serves as the economic and cultural center of the Styrian part of the Salzkammergut lakes region. With a population of 4,862, the town is said to be the geographical midpoint of Austria, symbolized by a stone monument in the centre of town.

Together with other Alpine towns Bad Aussee engages in the Alpine Town of the Year Association for the implementation of the Alpine Convention to achieve sustainable development in the Alpine Arc. Bad Aussee was awarded Alpine Town of the Year 2010.