Stiftskirche Klosterneuburg, Romanesque parish church in Klosterneuburg, Austria

Stiftskirche Klosterneuburg is a former three-aisled Romanesque basilica with a transept and crossing tower, rebuilt in the 17th century as a hall church with side chapels. Its exterior took its present form around 1890, with a Gothic north tower and a south tower rebuilt by Friedrich von Schmidt in 1882–1892.

The church was built by Margrave Leopold III of Babenberg and his wife Agnes, then consecrated in 1136. Its foundation was tied to the religious and political influence this family held in the region.

The Verduner Altar displays 51 gilded copper plates with biblical scenes crafted through medieval techniques that visitors can observe directly. These carefully decorated panels tell religious stories in a way that connects the medieval past to those standing before it.

Access is from Franz Rumpler-Str. 14 in central Klosterneuburg. Visitors should note that the church has varying access throughout the day and that services take priority during scheduled times.

The main organ, built 1636–1642 by the Freundt workshop of Passau, has three manuals, 35 stops and 2,179 pipes in a tall three-part case carved by Michael Schmidt, Georg Gemelich and Max Preyer. Its concert pitch is a' = 476 Hz, and international soloists have recorded on it.