Marjun Syderbø Kjelnæs (born 1974) is a Faroese novelist, poet, playwright and a singer. She is the author of eleven works in different genres. Among these are her two collections of poems: Rót Tripp (2012) and Opna (2016). Her stage play Tóm Rúm premiered on the Faroese national scene in 2014, and in 2016 the play was chosen to be a part of the Nordic Drama Train. Her novel Skriva í sandin is a contemporary book for young adults, taking place in Kjelnæs's hometown of Tórshavn. She cooperated with singer Eivør Pálsdóttir and DR Big Band on the musical composition At the Heart of a Selkie,