Violin Sonata No. 33 in E♭ major was composed by Wolfgang Amadeus Mozart in Vienna and listed in his personal catalogues of his works on December 12, 1785. It was published on its own by Franz Anton Hoffmeister, a German composer and music publisher to whom Mozart's String Quartet No. 20 is dedicated. The musicologist Marius Flothuis states that although much is unknown about the history of this sonata, it is certainly "one of the most mature works in Mozart's whole chamber output". Carl Friedrich Cramer in a 1783 review of this and Mozart's other mature piano and violin sonatas praised the style of composing for instruments in a democratic manner, fitting for the style, requiring skill and talent of both instrumentalists. Indeed, Manafu rates these sonatas as of crucial importance in the development of the genre.