Dellach is a municipality in the district of Hermagor, in the Austrian state of Carinthia. It is located in the southern part of Austria, within the Gailtal valley area of the Hermagor district.
As a municipality, Dellach is one of the administrative units that make up the Hermagor district, which lies in the western portion of Carinthia, near the borders with Italy and the East Tyrol exclave. The district's seat is the town of Hermagor.