Stiftskirche St. Peter und Paul, Benedictine church and monastery in Marsberg, Germany.

Stiftskirche St. Peter und Paul is a Benedictine church with a monastery in Marsberg, combining Gothic style elements with a spacious nave and several altars. The interior shows the typical layout of a monastic church with separate areas for monks and the faithful.

The monastery was founded in 785 or 799 by Charlemagne on the Eresburg after his victory over the Saxons; Pope Leo III confirmed its rights in 799. In 826 Louis the Pious attached it to Corvey as a priory. A fire destroyed town and priory in 1230, and the present church was built from 1240 in Gothic style on Romanesque remains. It was dissolved in 1803.

The church continues to serve as a place for worship and religious gatherings for the local community. The building reflects how monastic life shaped the rhythm and spiritual identity of the region over centuries.

The church is viewable from outside, and access to the interior depends on opening hours. Visitors should check with local tourist offices in advance about current visiting options and guided tours.

In the crypt beneath the choir, two Latin inscriptions survive on the walls; the north wall's text names 1 August, the feast of Saint Peter's Chains, as the annual commemoration of the church's consecration. The crypt altar was built only in 1932 and is dedicated to Saint Sturm, said to have raised the first altar here after the conquest of the Eresburg.