The Symphony No. 33 in B major, K. 319, was written by Wolfgang Amadeus Mozart, and dated on 9 July 1779.
The symphony is scored for two oboes, two bassoons, two horns, and strings, the smallest orchestral force employed in his last ten symphonies.
It has four movements:
The development section of the first movement is based on a theme that does not appear in the exposition: the four-note figure that is the principal theme of the Jupiter Symphony.
The order of the first and second subjects in the second movement are reversed in the recapitulation.
The autograph score is today preserved in the Biblioteka Jagielloà Âska, in Kraków.