Welschnonnenkirche, Baroque church in Trier, Germany

The Welschnonnenkirche is a Baroque church on Flanderstraße in Trier, built 1714–1716 for the Augustinian choir sisters known as Welschnonnen. It is a single-nave building of five bays ending in a straight choir wall, with a cross-ribbed vault over narrow pilasters and arches. A small roof turret sits on the steep slate roof; inside, the high altar retable of veneered wood shows the Assumption of Mary, flanked by figures of Pierre Fourier and Augustine.

The Welschnonnen, Augustinian choir nuns, came to Trier in 1640 and opened a girls' school in 1652. The foundation stone of their Baroque church was laid on 4 August 1714; the architect is unknown, and the church was consecrated in 1716. Napoleon spared the congregation for its educational work, but in 1874 the Prussians expelled the sisters during the Kulturkampf, and the church passed to the Marianische Jünglingskongregation. Since 1969 the Marianische Bürgersodalität has owned it.

The church has served as a gathering place for Trier's community for centuries. Today it continues to host both religious services and cultural events, reflecting how the space adapts to different needs of the people around it.

The church is entered from Flanderstraße, just north of the Dombering. The former chapter hall, with its own choir stalls, is reached by a spiral staircase behind the high altar; the sacristy is on the ground floor. English-language Mass is usually celebrated on Sundays at 3 p.m., and the parish of Liebfrauen used the church as a substitute after the Second World War.

The two bronze bells hang in the lower lantern of the small roof turret. The larger, Petrus Fourier, was cast in 1860 by Mabilon in Saarburg and weighs about 120 kg; the smaller, inscribed "Namen Jesu", was cast in 1615 by Heinrich Grongnart of Dinant and came from the former Jesuit college's seminary, whose tower had become unsafe.