Finn Mortensen (January 6, 1922 – May 23, 1983) was a Norwegiancomposer, critic and educator. Finn Einar Mortensen was born in Oslo. His parents were publisher Ernst Gustav Mortensen (1887–1966) and Anna Marie Damnæs (1886–1960). Mortensen grew up in a publishing environment and it was at first expected that he would go into his father's publishing firm, Ernst G. Mortensens Forlag A/S. He studied harmony with Thorleif Eken (1900–1955), composition with Klaus Egge and with Niels Viggo Bentzon at The Royal Danish Academy, as well as the piano and double bass at the Oslo Conservatory of Music. He also participated in the Darmstadt summer school and in the classes conducted by Karlheinz Stockhausen at the Studio für Elektronische Musik in Cologne.