Kjell Mørk Karlsen (born 31 March 1947) is a Norwegian composer and organist.Mørk Karlsen was born in Oslo, and at first studied with his father, the composer and organ player Rolf Karlsen. Mørk Karlsen later enrolled at the Oslo Music Conservatory and graduated in 1968.Throughout his career, Mørk Karlsen has focused on medieval, renaissance and baroque music which led him to founding the Oslo Pro Music Antiqua ensemble and leading it until 1974. He has also maintained close ties to the Musica Sacra movement, which has as its aim to renew interest in liturgy and early church music. Mørk Karlsen was also active as an organist throughout his professional career, retiring from the post as Asker Church organist in 2011.