St. Sebastian, Würselen, Roman Catholic church in Würselen, Germany

St. Sebastian is a Catholic parish church in central Würselen, built of light cream masonry with grey stone trim. Its west tower, largely Romanesque from 1150–1200, now carries a pyramidal roof instead of the baroque spire destroyed in 1944. The nave planned by Laurenz Mefferdatis in 1725 was extended eastward by Heinrich van Kann in 1906–1908 with a transept, a larger choir and a dome on an octagonal base; the cross-shaped plan measures 65 m by 32 m, the dome 40 m high.

A document of 17 October 870 records Louis the German transferring the church "zu wormsalt" to Prüm Abbey; it was probably a Frankish wooden post church. Excavations in 1938 beside today's church found rubble-stone foundations dated to around 600, though no archaeological proof of an early church on the site exists. Between 1150 and 1200 a three-nave Romanesque church was built, whose west tower survives inside the present building.

The parish is called the "Würselener Dom" because of its size, and since 2010 it has been the largest merged parish in the Diocese of Aachen, formed from eight formerly independent parishes. The high altar, 12 m tall and 7 m wide, fills the choir niche and shows Saint Sebastian; its tabernacle is attributed to Johann Joseph Couven (1758), though this is not historically certain.

The church stands in the centre of Würselen, with the main entrance beneath a small round window and the nave under a dark multi-panel roof. The west tower, rebuilt after 1944 with sound arcades and a tent roof, rises 31 m; the crossing dome reaches 40 m. Look for the 12 m high high altar filling the choir niche.

The oldest bell, cast in 1275, was long used as the Angelus bell and now serves only as the transformation bell; it was lent for a time to the new St. Pius X church in Schweilbach/Teut. The four bronze bells in the tower include the Maria bell of 1384, the Balbina bell of 1432, the Sebastiana bell of 1954 and the Pius bell of 1961, the last weighing 4,600 kg and among the largest cast by the Otto foundry.