Our Lady Treuenbrietzen, Gothic church building in Treuenbrietzen, Germany.

St. Marien is a fieldstone and brick church in Treuenbrietzen, built from before 1217 as a cruciform pillar basilica. Its east end (apse, choir, transept) is rough fieldstone with round-arched windows, while the nave and west tower are brick; the tower, begun in 1452, has a late-Gothic spire over four gables.

Construction of St. Marien began before 1217 and continued into the third quarter of the 13th century as a cruciform pillar basilica. The west tower was started only in 1452 and received its helm over four gables in the early 16th century. The north side choir was demolished around 1720.

The town grew from two settlements, each with its own parish church; St. Marien served the castle settlement around the Ascanian border fortress, while St. Nikolai served the merchants' settlement. The church is an open church of the Treuenbrietzen parish in the Mittelmark-Brandenburg district of the Evangelical Church Berlin-Brandenburg-Silesian Upper Lusatia. West of the building stands the Lutherlinde, a large-leaved lime of 400 to 500 years with a 6.2 m trunk circumference, repeatedly stabilized.

St. Marien is an open church of the Treuenbrietzen parish. Enter from the south side; the west tower, begun in 1452, stands at the opposite end from the choir. West of the church grows the Lutherlinde, a summer lime with a trunk about 6.2 m around, held together by several supports.

The building shows a visible change of material: the apse, choir, transept and easternmost side-aisle bays are faced with carefully cut fieldstone, while the rest of the church and the west tower are brick. The west tower was begun only in 1452, and the transept gable triangles are brick too.