St. Peter an der Sperr, Art and history museum in Wiener Neustadt, Austria.

St. Peter an der Sperr is a former Dominican convent church on Johannes-von-Nepomuk-Platz in Wiener Neustadt, now an exhibition hall connected to the town museum in the old convent. Its three-bay nave and two-bay choir with five-eighth close stand free, buttressed and lit by three-light tracery windows. The south portal, once dated 1465, is framed by seven statuette niches in two zones; the windowless north front follows the former town wall.

A Dominican convent was founded here before 1250; the church and convent were rebuilt in the third quarter of the 14th century. In 1444 Dominicans from Neukloster took over, and from 1450 to 1475 the builder Peter Pusika renewed the church. In 1544 Clarisses fleeing the Turks from Tyrnau moved in; the convent was dissolved in 1574. In August 2016 archaeologists found two medieval graves ahead of the 2019 Lower Austrian State Exhibition.

The name refers to the church's position at a barrier (Sperre) in the town wall, not to a saint. The former convent church now serves as an exhibition hall, while the adjoining convent buildings house the Museum St. Peter an der Sperr, opened after a conversion costing five million euros. The convent garden, called Bürgermeistergarten, is freely accessible.

The church stands free on Johannes-von-Nepomuk-Platz at the corner of Wiener Straße and Petersgasse, its west side joined to the museum building. The north front along the former town wall has no windows, so the entrance and the late Gothic south portal face the street. The Bürgermeistergarten in front of the museum is freely accessible.

The south portal, once dated 1465, is framed by a round-arched, rectangular surround with interpenetrating spherical and straight mouldings, a form the German source calls unique in Austria. Above it, seven small statue niches sit in two rows within a nearly square field. Look for the corbels of a former protective roof over the entrance.