(Franz) Joseph Haydn (/ˈdʒoʊzəf ˈhaɪdən/; German: [ˈjoːzɛf ˈhaɪdən] ( ); 31 March 1732 – 31 May 1809), known as Joseph Haydn, was a prominent and prolific composer of the Classical period. He was instrumental in the development of chamber music such as the piano trio and his contributions to musical form have earned him the epithets "Father of the Symphony" and "Father of the String Quartet".

A lifelong resident of Austria, Haydn spent much of his career as a court musician for the wealthy Esterházy family at their remote estate. Until the later part of his life, this isolated him from other composers and trends in music so that he was, as he put it, "forced to become original". At the time of his death, aged 77, he was one of the most celebrated composers in Europe.