Piarist Church, Baroque church in Josefstadt, Austria.

The Piarist Church on Jodok-Fink-Platz in Vienna's 8th district has a two-tower facade with a slightly convex central section and columns; the towers were raised and given pointed spires in 1858–1860. The white stone front carries the inscription "DEO UNI ET TRINO", a clock in a round window and a golden cross and star on the pediment. Inside, six chapels surround a complicated ground plan, and Franz Anton Maulbertsch painted the ceiling frescoes in 1752–53.

The Piarists founded their Vienna house in July 1697, and on 2 September 1698 Emperor Leopold I laid the foundation stone of a small chapel that still stands. The church cornerstone followed on 20 April 1716, built to a design attributed to Johann Lukas von Hildebrandt. The shell was finished by 1721, the dome in 1751–53, and Franz Anton Maulbertsch painted the ceiling frescoes in 1752–53. The first solemn service at the completed high altar was held at Pentecost 1756.

The church takes its name from the Maria Treu image painted by Josef Herz during the 1713 plague epidemic and moved from the Chapel of Sorrows into the new building; from 1721 the dedication was Maria Treu. The Piarists ran the Piaristengymnasium next door, and the street in front was renamed Jodok-Fink-Platz in 1929.

The building is located near Theater in der Josefstadt and is easily reached on foot. Regular services take place here, and visitors should plan their visit for daytime hours to fully appreciate the interior decorations and frescoes.

The church's name refers to the Maria Treu image of grace, painted by Josef Herz for the 1713 plague epidemic. It was moved from today's Chapel of Sorrows into the new church, and from 1721 the dedication was changed to Maria Treu. The small chapel of 1698 still links the main building to the convent wing at a right angle.