The Lutheran Protestant Church of St. Reinold is, according to its foundation date, the oldest extant church in Dortmund, Germany; it is dedicated to Reinold, also known as Renaud de Montauban, the patron of the city. The church was built as a palatine church in the Ottonian era. The present building is a late Romanesque church with a late gothic quire. St. Reinold's was built from 1250 to 1270, and is located in the centre of the city, directly at the crossing of the Hellweg and the historic road from Cologne to Bremen. St. Reinoldi's congregation is a member of the Evangelical Church of Westphalia, an umbrella comprising Lutheran, Reformed and united Protestant congregations.
Efforts to complete the tower of St. Reinold's were renewed in 1443. After its completion in 1454, it was 112 m tall and was referred to as the "Miracle of Westphalia". The polygonal spire was renovated the first time in 1519. On 24 June 1520, the copper roofing was completed, and on 27 July the spire was added. The apex of the church was now about seven metres higher. In 1562 the pastors and congregations of Dortmund confirmed their adoption of Lutheranism in St. Reinold's Church.