St. Lambertus, Parish church in Kalterherberg, Germany.

St. Lambertus is a parish church in Kalterherberg featuring a striking double-tower facade that rises approximately 42 meters (138 feet) and is built in Romanesque Revival style. The structure follows a three-aisled basilica design with stone walls sourced from the nearby Richelsley quarry.

The building originated from a chapel first mentioned in 1550 and became an independent parish church in 1804. During the rapid growth of the Monschau textile industry, it underwent significant expansion and renovation.

The interior showcases glass mosaics created by Heribert Reul and features a statue of Stephan Horrichem, a former prior of Reichenstein monastery. These artworks shape the character of the sacred space and reflect the spiritual heritage of the local community.

The church stands at Arnoldystraße 4 in the Kalterherberg district of Monschau, close to the German-Belgian border. Visitors enter through the portal designed by Egino Weinert during the 1954–1957 renovation. The neo-Romanesque interior is laid out as a three-aisled basilica, so the side aisles and the choir with its rounded apse are reached on foot from the entrance.

The church houses five rosary windows depicting the holy family, created by the stained glass company Oidtmann from Linnich in 1902. These colored windows are noteworthy because they showcase a labor-intensive craft that was still entirely handmade at that time.