Marien may refer to: Domkirche St. Marien (English: St. Mary's Cathedral), the modern Roman Catholic cathedral in Sankt Georg, Hamburg, Germany Mariendom (Hamburg) (English: St. Mary's Cathedral), the ancient cathedral in Altstadt, Hamburg, Holy Roman Empire, demolished between 1804 and 1807 Mariendom (English: St. Mary's Cathedral), the Roman Catholic cathedral of Speyer, Palatinate, Germany Marien Ngouabi University, the only state-funded university in the Republic of Congo Saint-Marien, commune in the Creuse department in central France Sankt Marien, municipality in the district Linz-Land in Upper Austria, Austria Stade Joseph Marien, multi-use stadium in Brussels, Belgium, named after the sports administrator Joseph Marien (died 1933) People Marien Tailhandier (1665–1738), soldier-surgeon after his arrival in Canada in 1685 Frank Marien (1890–1936), Australian editor of Smith's Weekly Joseph Marien (1900–1950), Belgian Olympic runner Marien Oulton Dreyer (1911–1980) Marcel Mariën (1920–1993), Belgian surrealist (later Situationist), poet, essayist, photographer, collagist, filmmaker Léopold Marien (1934–2018), former Belgian decathlete Marien Ngouabi (or N'Gouabi, 1938–1977), military President of the Republic of the Congo from 1969 to 1977 Robert Marien (born 1955), Québécois (Canadian) actor, singer, and songwriter Marien Michel Ngouabi (born 1980), Congolese former swimmer Hanna Mariën (born 1982), Belgian sprinter who specializes in the 200 metres Rudi Mariën, Belgian scientist and businessman de:Mariën