Friedenskirche, Baroque church in Saarbrücken, Germany

The Friedenskirche is an aisleless Baroque church on Wilhelm-Heinrich-Straße in Saarbrücken, built as a transverse church (Querkirche) with a hipped roof. Its north side has a broad central risalit with pilasters and a triangular pediment; the south tower has three square storeys, corner pilasters and a slate hood with a welsche Haube. The west entrance is framed by a Baroque aedicula with an oculus.

Architect Friedrich Joachim Stengel designed and built the church between 1743 and 1751. The construction was funded by generous donations from Prince Wilhelm Heinrich along with collections gathered from England and Holland.

The church takes its name from the peace between the Reformed and Lutheran congregations sealed by the Saarbrücken Union of 1817. Until April 2014 it was used jointly: the Old Catholic altar stood at one narrow end of the broad hall, the Russian Orthodox iconostasis at the other. Since then the Old Catholic community has worshipped here alone.

The church stands on Wilhelm-Heinrich-Straße in central Saarbrücken and is easily reached on foot. Extensive technical modernization and renovations both inside and outside were completed between 2016 and 2017 to maintain the building's condition.

From 1820 to 1892 the former church housed the Ludwigsgymnasium: a ceiling was inserted and small rectangular windows cut into the walls. The Old Catholic congregation bought the building in 1892 and renewed the interior as a church. From 1961 to 1966 the exterior was rebuilt to Stengel's plans, and the church was reconsecrated on 11 March 1967.