Mozarthaus St. Gilgen, Mozart family museum in Sankt Gilgen, Austria.

Mozarthaus St. Gilgen occupies the former Pfleggericht (local court) building, rebuilt between 1718 and 1720 by Sebastian Stumpfegger for Mozart's maternal grandfather Wolfgang Nikolaus Pertl. The coat of arms above the entrance portal, carved by Wolf Weissenkhürchner, carries a chronogram for 1720. One of the earliest mansard-roofed buildings in the Salzburg region, it has a west annex from 1759 and a marble fountain with a bronze child figure by Toni Schneider-Manzell beside it, added in 1991.

The house is documented in 1569 and became the seat of the St. Gilgen Pfleggericht in 1691. Mozart's maternal grandfather, Wolfgang Nikolaus Pertl, had it rebuilt between 1718 and 1720 by Sebastian Stumpfegger; the portal coat of arms by Wolf Weissenkhürchner carries a chronogram for 1720. Anna Maria Pertl was born here on 25 December 1720, and Nannerl lived here from 1784 until her husband's death in 1801. The Mozartdorf St. Gilgen cultural association acquired the house in 2005, and it was placed under monument protection in 2007.

The collection displays letters and personal belongings of Mozart's mother Anna Maria and his sister Nannerl, who spent many years living in Sankt Gilgen. These items tell stories of their everyday life in the region and their connections within the wider Mozart circle.

The house stands in the centre of Sankt Gilgen, a short walk from the Wolfgangsee shore. The former Pfleggericht rooms and the Falkensteinsaal host the chamber orchestra M. A. Mozart St. Gilgen, and the house and its large lakeside garden can be rented for seminars, weddings and anniversaries. The multimedia show is offered in German, English, Italian and Japanese.

Wolfgang Amadeus Mozart never visited the house where his mother was born or where his sister later lived. The connection was forgotten until 1905, when judge Anton Matzig found old files in the attic of the district court and reconstructed the family's links to the building.