St. Lambertus, Catholic parish church in Rellinghausen, Germany

St. Lambertus is a stone church in Rellinghausen. Its 12th-century Romanesque west tower has a steep pyramidal roof, a clock face and a cross at the peak. The classical hall, built 1826–1828, has large round-arched windows with tracery and a lower annex with a wooden door.

The medieval church suffered severe damage in the early 1800s and was rebuilt between 1826 and 1828 using designs by Otto von Gloeden and Karl Friedrich Schinkel. Reconstruction after 1944 damage changed the building significantly, as only the tower and sacristy of the original structure survived.

The church is dedicated to St. Lambert, though it was originally under the patronage of St. James as a collegiate church. The altarpiece from the early 18th century came from the St. Anna chapel and shows a priest gathering up stolen hosts. The former Marienglocke, cast around 1500, weighed 475 kg and bore a German inscription asking Mary to pray for all.

Visiting is possible during regular opening hours posted at the door, which align with service times. The interior has space to walk through comfortably, but wearing flat shoes and behaving respectfully is advisable.

The 12th-century Romanesque west tower lost its baroque dome after 1944; it now carries a blunt pyramidal roof. Inside, a round basin set with heads is a fragment of a 12th-century Romanesque font. The 1993 organ by Flentrop has 36 stops on three manuals and pedal.