St. Mariä Himmelfahrt, Parish church in Jülich, Germany.

St. Mariä Himmelfahrt is a Roman Catholic parish church in Jülich. Its square bell tower retains three Romanesque lower storeys of reddish-brown stone, topped by two white upper storeys and a steep pyramidal roof with a weather vane. The long, lower nave, rebuilt in 1952 by Peter Salm, has white walls with tall, narrow windows framed in reddish-brown.

The site was first documented in 945, though excavations reveal Roman foundations dating from the 4th century beneath the current structure. Over subsequent centuries it became the focal point of Jülich's ecclesiastical administration and remained central to local religious practice.

The church was dedicated to St. Martin of Tours until the 15th century, when it was placed under the patronage of the Assumption of Mary. Since 2026 it has been the parish church of the large parish Hl. Maria Magdalena/Jülich. The tomb of Blessed Christina von Stommeln, brought here in 1386 by Duke Wilhelm II of Jülich, survived the 1944 destruction largely intact.

The church stands in central Jülich, partly on the foundations of the 4th-century Roman town wall, which still sets its alignment. The tower keeps its three Romanesque lower storeys; the two upper storeys and the nave date from Peter Salm's 1952 rebuilding after the 16 November 1944 air raid. North of the church, on the square, stands a Marian column by María Jesús Ortíz de Fernández, installed in 1998.

The church keeps the grave of Christina von Stommeln, a mystic whose remains Duke Wilhelm II of Jülich moved here from Nideggen in 1386. The tomb survived the near-total destruction of the church in the air raid of 16 November 1944, when only the lower three storeys of the tower and the outer walls of the neo-Romanesque apse stood.