Josef Mysliveček (9 March 1737 – 4 February 1781) was a Czech composer who contributed to the formation of late eighteenth-century classicism in music. Mysliveček provided his younger friend Wolfgang Amadeus Mozart with significant compositional models in the genres of symphony, Italian serious opera, and violin concerto; both Wolfgang and his father Leopold Mozart considered him an intimate friend from the time of their first meetings in Bologna in 1770 until he betrayed their trust over the promise of an operatic commission for Wolfgang to be arranged with the management of the Teatro San Carlo in Naples. He was close to the Mozart family, and there are frequent references to him in the Mozart correspondence.
Mysliveček was born in Prague, one of twin sons of a prosperous mill owner, and studied philosophy at Charles-Ferdinand University before following in the footsteps of his father. No documentation exists to support claims that he was actually born in Horní Šárka, a rural district to the north and west of Prague in the early eighteenth century. He achieved the rank of master miller in 1761, but gave up the family profession in order to pursue musical studies. In Prague, he studied composition with Franz Habermann and Josef Seger in the early 1760s. His ambitions led him to travel to Venice in 1763 to study with Giovanni Pescetti. His travel to Italy was subsidized in part from family wealth, in part from the Bohemian nobleman Vincenz von Waldstein. In Italy he became known as Il Boemo ("the Bohemian") and also Venatorini ("the little hunter"), a literal translation of his name. Reports that he was known as Il divino Boemo ("the Divine Bohemian") during his lifetime are false. The nickname originated from the title of a romanetto about the composer by Jakub Arbes that was first published in 1884. He was made a member of the Accademia Filarmonica di Bologna in 1771. Mysliveček prized freedom of movement and was never employed directly by any noble, prelate, or ruler, unlike most of his contemporaries. He earned his living through teaching, performing, and composing music, and frequently received gratuities from wealthy admirers. Financially irresponsible throughout his life, he died destitute in Rome in 1781. He is buried in the church of San Lorenzo in Lucina, where a memorial placed by latter-day Czech admirers can be seen. No trace has ever been found of a memorial in marble supposedly erected shortly after his death by James Hugh Smith Barry, a wealthy English student of Mysliveček who paid for his funeral expenses.