''''Symphony No. 6''' in F major, K. 43, was composed by Wolfgang Amadeus Mozart in 1767. According to Alfred Einstein in his 1937 revision of the Köchel catalogue, the symphony was probably begun in Vienna and completed in Olomouc, a Moravian town to which the Mozart family fled to escape a Viennese smallpox epidemic;Zaslaw, pp. 109–112 see Mozart and smallpox.
The symphony is in four movements, and is Mozart's first in the key of F. Its initial performance was at Brno on 30 December 1767 The autograph of the score is today preserved in the Biblioteka Jagiello\u0144ska in Kraków. ISMN M-006-20466-3