Louis Andriessen (born 6 June 1939 in Utrecht, Netherlands) is a Dutch composer and pianist based in Amsterdam. He teaches composition at the Royal Conservatory of The Hague, and his music is published by Donemus in the Netherlands and Boosey & Hawkes in the United Kingdom. His recordings appear on the Nonesuch Records label. Andriessen was born into a musical family, the son of the composer Hendrik Andriessen (1892-1981), brother of composers Jurriaan Andriessen (1925-1996) and Caecilia Andriessen (1931-), and nephew of Willem Andriessen (1887-1964). Andriessen originally studied with his father and Kees van Baaren at Royal Conservatory of The .