The Church of St. Denis (French: Collégiale Saint-Denis) is a parish church in Liège, Belgium. The fortified building was designed to be part of the city's defences. It was founded by Notker of Liège in 987 and first consecrated on 12 March 990. The tower was added around 1100.

The Church of St Denis originally had the status of collegiate church. It was one of the seven collegiate churches of Liège, which until the Liège Revolution of 1789 collectively comprised the "secondary clergy" in the First Estate of the Prince-bishopric of Liège. The church was suppressed in 1797, but the building was taken into use as a parish church in 1803.