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.

The town began to flourish in the Middle Ages, when salt works started operating in the late thirteenth century.

The Spitalkirche (hospital church) on Meranplatz square was erected before 1395 and contains two Gothic altarpieces with movable wings from the fifteenth century and frescoes.

Bad Aussee was the birthplace of Anna Plochl, a postman's daughter who became the wife of Archduke Johann of Austria, whose economic, cultural, and educational impact on Styria and the Salzkammergut is still remembered by the people.

Toplitzsee, where the Nazis both tested weapons and allegedly dumped counterfeited currency, is the source of much local lore in the region.

A small business offers guided tours to Kammersee in so-called Plätten, a flat-bottomed boats unique to the region, that were once used in the salt trade.

During the reign of Maria Theresa, convicts chiseled an opening in the stone separating Kammersee from Toplitzsee in order to aid in the transportation of lumber.

The biggest yearly event in Bad Aussee occurs on Faschingsdienstag (Shrove Tuesday), when the Flinserln dress up in sequined costumes and parade through town to announce the coming of spring.

The Flinserln are accompanied by the Zacharin, who keep spectators in line by waving pig bladders on the ends of sticks and occasionally rapping people on the head with them.

Inns, pubs and restaurants are heavily frequented during the Heilige Drei Faschingstage (the three 'holy' days of Fasching) by costumed revelers known as Maschgera.

Every spring, on the last weekend in May, participants construct massive floral sculptures made from daffodil blossoms, and parade them through town on large floats, accompanied by regional folk music.