St. Nikolaus, Catholic parish church in Büren, North Rhine-Westphalia, Germany

St. Nikolaus is a three-aisled Romanesque cross-basilica in the centre of Büren, built as the town's market church at the end of the 12th century and first documented in 1220. Its rough tan and brown stone blocks carry a tall square west tower capped by a dark multi-tiered spire with a clock face and a golden cross; a slender spire rises from the steep roof over the crossing. The front facade has a large round tracery window above an arched portal, and lower roofed annexes with arched windows adjoin it on the right.

St. Nikolaus was built at the end of the 12th century as the market church of Büren by the brothers Detmar and Berthold von Büren, and it is first documented in 1220. Fires in the 17th century led to costly renovation; the upper storey of the west tower was renewed in 1682. The tower helm was completed in 1858, and a thorough restoration ran from 1966 to 1968.

The church is dedicated to Saint Nicholas, whose statue has stood in front of the building since 2008. Inside, a wooden pulpit carved around 1600 and a double Madonna are among the pieces visitors can see. The parish belongs to the Pastoral Association of Büren in the Archdiocese of Paderborn.

St. Nikolaus stands in the pedestrian centre of Büren, the oldest building in the inner town, so it is reached on foot from the market square. The church is open during the day; guided tours are arranged on request rather than on a fixed monthly schedule. The 1966–68 renovation left the interior level and step-free along the central aisle.

The organ was made in 1744 by Patroclus Möller for Böddeken Monastery and came to Büren in 1804. Franz Breil restored it in 1953–1957, replacing the pneumatic cone chests with mechanical slider chests and adding the Brustwerk as a third manual that Möller had already planned. It now has 43 stops on three manuals and pedal.