St. Marien Kathedrale, or St. Mary's Cathedral, serves as the heart of the Roman Catholic community in Windhoek, acting as the seat for the Archdiocese of Windhoek. Nestled on Karl-Werner Street at the city’s core, this place of worship conducts daily religious services, save for Monday evenings. Constructed between 1906 and 1908 using local materials, the cathedral showcases a blend of brickwork and Romanesque Revival architectural elements.

The exterior is marked by its porch, which is framed by three semicircular arches beneath an overarching structure and topped with a triple. Two quadrangular towers stand guard on either side, each rising through four levels before culminating in white-painted arrows that pierce the sky.