Rathaus Klagenfurt, Municipal building in Neuer Platz, Klagenfurt, Austria.

Rathaus Klagenfurt is an administrative building occupying the western edge of Neuer Platz, extending across fifteen window axes in length and seven in width. The Renaissance structure features a large portal made of chlorite schist with a rectangular design, rounded arches, and columns topped with spherical elements.

The foundation of the current building was laid between 1580 and 1582 under the direction of Paul Fertig, who served as secretary to the provincial governor. This created one of the city's early Renaissance structures, reflecting Klagenfurt's growing importance.

The building has been Klagenfurt's town hall since 1 November 1918, when the Rosenberg family exchanged it for the Old Town Hall. The name change is still visible in the older designation Palais Rosenberg. The Renaissance corner oriels, typical of Klagenfurt's 16th-century townhouses, are easy to spot on the facade.

The building houses municipal administration and is open to the public during regular business hours. Visitors should note that some areas may be reserved for official ceremonies and access could be restricted.

The staircase inside is a two-flight stair of low, broad steps with a pilaster balustrade of chlorite schist, the green-grey stone also used for the portal. The source notes it recalls the stairs in the Landhaushof courtyard.