Untertauern is a municipality in the district of St. Johann im Pongau, in the Austrian state of Salzburg. It is located in the Pongau region of the state, within the Alpine terrain of central Austria.
As a municipality, Untertauern is one of the local administrative units of the St. Johann im Pongau district, which forms part of the Salzburg federal state structure. The area lies in a mountainous part of the country, consistent with the wider geography of the Salzburg region.