Johann Nepomuk Church, Parish church in Leopoldstadt, Vienna, Austria

Johann Nepomuk Church is a parish church on Praterstraße in Vienna's Leopoldstadt district, between Nepomukgasse and Rotensterngasse. Built in 1841–1846 by Carl Rösner, it is an early Historicist block with a five-bay facade, a two-storey elevation and a three-storey polygonal facade turret topped by a tall spire. The interior is a three-aisled, three-bay pillared hall with cross-ribbed vaults.

The church was built in 1846 to serve the growing local community and was later designated as a protected monument. It reflects the period of church construction during Vienna's expansion in the 19th century.

The church grew out of a copy of the Maria Pötsch image, called "Rosa mystica in der Jägerzeile", venerated in a private house and credited with surviving a 1729 fire. After the district was spared an epidemic in 1730–31 and the image survived a 1734 storm, a stone chapel was built and dedicated to John of Nepomuk in 1736. The high altar still holds the image.

The main front faces Praterstraße between Nepomukgasse and Rotensterngasse, and a stairway down to the Nestroyplatz U-Bahn station opens right by the church. Enter through the three portals under the tall round-arched window; inside, the three-aisled hall is best seen from the rear under the three-bay porch.

The church grew from a miraculous image of Mary, a copy of the Maria Pötsch icon in St. Stephen's, called "Rosa mystica in der Jägerzeile". It survived a 1729 fire unharmed, then a 1734 storm that shattered the tree it hung on, and was venerated as wonder-working.