St. Marien, Gothic Revival church in Baukau district, Herne, Germany.

St. Marien is a red-brick Gothic Revival hall church with transepts, built largely in 1907–1909 to designs by Johannes Franziskus Klomp. Its twin towers rise about 60 metres to copper-clad spires; the right tower carries a black clock with gold hands and numerals. Between them a gabled section holds a dark rose window, a crowned statue of Mary with the Child, and a pointed-arch portal flanked by four brick columns with Corinthian capitals.

The parish was founded on 29 September 1901, after the first construction phase was completed in summer 1900 for 76,143.03 marks and blessed on 5 August 1900. The Bochum architect Hermann Wielers drew the restrained 1899 plan; the present form follows designs by Johannes Franziskus Klomp, built largely in 1907–1909. The sculptor Heinrich Schweppenstedde made the high altar, side altars, pulpit and communion rail in 1900–1902.

The parish of St. Marien was founded on 29 September 1901, after Baukau had grown as a vicariate of the Herne St. Bonifatius community. The church is run with a focus on children's church within the St. Dionysius parish of the Emschertal deanery, Archdiocese of Paderborn. The name refers to Mary, mother of Jesus, whose crowned figure with the child stands above the main portal.

The main portal faces Bismarckstraße, between Kaiserstraße and Westring, in the north of Herne; the church is oriented southwest to northeast, so the twin-tower facade is the street side. The surrounding Wilhelminian-era blocks make the red brick front easy to find on foot. The building is a parish church with a focus on children's services, so visits depend on parish use.

The 1974 renovation replaced most of the original Wiedenbrück School interior. Sculptor Josef Baron of Unna-Hemmerde designed the altar, tabernacle and baptismal font base in white Italian marble, while the ambo, candlesticks and font are bronze. Two reliefs from the old high altar, the Nativity and the Ascension, survive, along with figures of Peter and Paul.