Festspielhaus St. Pölten, Modern concert hall and theatre in St. Pölten, Austria.

Festspielhaus St. Pölten is a performing arts venue in the Regierungsviertel of St. Pölten, designed by Austrian architect Klaus Kada and opened in 1997. It has four halls: the Große Saal with 1,063 seats, 70 standing places and 4 wheelchair spaces, the Kleine Saal for chamber music, and two rehearsal stages. The Große Saal's iron curtain, painted by Eva Schlegel, measures about 20 m wide and 10.5 m high and weighs 14.5 tons.

The building opened in 1997 and marked a turning point in Lower Austria's cultural landscape by creating a regional center for performing arts. This establishment positioned St. Pölten as an important venue for professional artistic activities in the region.

The venue serves as home to the Tonkünstlerorchester Niederöstereich and shapes the city's cultural life through regular opera, ballet, and concert performances. Visitors experience a wide range of classical music and contemporary theater that brings recognition to the region beyond its borders.

The Große Saal seats 1,063 with 70 standing places and 4 wheelchair spaces; its ceiling, walls and proscenium can be adjusted for dance or concert use. A concert shell built for orchestral programmes shapes the acoustics, and the iron curtain by Eva Schlegel, about 20 m wide and 10.5 m high, separates audience from stage. The Kleiner Saal hosts chamber music, while Probebühne 1 and 2 serve smaller formats.

The iron curtain of the Große Saal, designed by artist Eva Schlegel, measures almost 20 metres wide and over 10.5 metres high, weighs 14.5 tonnes and is described as the largest picture in the country. The side walls and balustrades were executed by Bernhard Schutti in traditional marmorino.