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Rien may refer to:
Given name The Dutch given name is usually a short form of Marinus/Rinus
Rien van IJzendoorn (born 1952), Dutch professor of child and family studies Rien Kaashoek (1937–2024), Dutch mathematician Rien Long (born 1983), American college football player Rien Morris, Marshallese government minister Rien Poortvliet (1932–1985), Dutch draughtsman and painter Rien van der Velde (born 1957), Dutch politician
Places Rien, Netherlands, a village in the province of Friesland, Netherlands Rien (Norway), a lake in Norway
Music albums Named after the French word for "nothing": Rien (Faust album), 1994 Rien (Noël Akchoté album), 2000