Gosau is a municipality with 1774 inhabitants (as of 1 January 2016) in Upper Austria in the district of Gmunden in Traunviertel, and is in the Gosautal, a tributary of the upper Trauntals at Lake Hallstatt. The region is located in the Inner Salzkammergut, on the edge of the UNESCO World Heritage Hallstatt-Dachstein Salzkammergut. The community is located in the judicial district of Bad Ischl.