Symphony no. 6 in F major, K.43

Symphony No. 6 in F major, K. 43, was composed by Wolfgang Amadeus Mozart in 1767 when he was eleven. 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 city to which the Mozart family fled to escape a Viennese smallpox epidemic.

The symphony is in four movements. Its initial performance was at Brno on 30 December 1767. The autograph of the score is today preserved in the Jagiellonian Library in Kraków.