Marien Ngouabi (or N'Gouabi) (December 31, 1938 – March 18, 1977) was the third President of the Republic of the Congo from January 1, 1969, to March 18, 1977.

Stade Omnisport Marien Ngouabi d'Owando is a multi-use stadium in Owando, Republic of the Congo. It is used for football matches and serves as the home of AC Léopard of the Congo Premier League. It holds 13,037 people and opened in 2009.

Marien Ngouabi University (French: Université Marien Ngouabi, UMNG) is the only state-funded university in the Republic of Congo. It is located in the capital of Brazzaville.

Marien Michel Ngouabi (born June 3, 1980) is a Congolese former swimmer, who specialized in sprint freestyle events. Ngouabi represented the Republic of the Congo at the 2000 Summer Olympics, where he became the nation's flag bearer in the opening ceremony. He is also the grandson of Marien Ngouabi, the former president of the Republic of the Congo.

Marien may refer to:

Marien Carretero (born December 6, 1987) is a model.

Stade Joseph Marien is a multi-use stadium in Brussels, Belgium. It is currently used mostly for football matches and is the home ground of Royale Union Saint-Gilloise. The stadium holds 8,000 and was opened in 1919. It is located within the Duden Park in the municipality of Forest, and its entrance is at one end of the Rue du Stade.