St. Marien Schildau, Medieval church in Belgern-Schildau, Germany.

St. Marien is a rubble-stone church with plastered ashlar corners in Schildau, its oldest part a square four-storey tower with a pyramidal roof and walls 1.60 metres thick at ground level. Around 1170 a late Romanesque basilica was added, and the Romanesque arch remains visible in the tower's east wall. In the 15th century the columns were removed, the clerestory windows walled up and a cross-ribbed vault installed, producing the stepped hall seen today; the rounded apse has a dark conical roof.

The tower, with walls 1.60 metres thick at ground level and an entrance on the east side of the first floor reached by ladder, is the oldest part and points to use as a defensive church. The late Romanesque basilica was added around 1170; its wide Romanesque arch remains visible in the tower's east wall. In the 15th century the columns were removed, the clerestory windows walled up and a cross-ribbed vault installed, likely to repair damage from the Hussites. The roof structure was raised in 1783–1784 and restoration followed in 1829–1833.

The Renaissance baptismal font and 15th-century winged altar with carved figures of Jesus and Mary show how the community valued artistic craftsmanship. These artworks still shape the interior and speak to the place's religious heritage.

The church is part of the local community and opens for regular services managed by the Torgau-Delitzsch church district. Visitors should check ahead about access times, as these may vary depending on the season and upcoming events.

Inside the church lies a special treasure: a 15th-century cabinet made from long-fibered coniferous wood, possibly the only original piece of its kind in Saxony. This unusual wooden piece in the sacristy reveals the high craftsmanship that once flourished in the region.