Jan Křtitel Kuchař, or also German: Johann Baptist Kucharz (5 March 1751 in Choteč – 18 February 1829 in Prague) was a Czech organist, mandolinist, harpsichordist, music composer, operatic conductor, and teacher.
In Prague, he also began teaching music for the noble Hartig, Bucquoy and Příchovský families.
In the year 1786, he most likely played in the Stavovské divadlo at the premiere of The Marriage of Figaro and in January 1787 he became acquainted with Mozart on his Prague visit.
He also began to perform stand-alone concerts and his reputation soon spread, for in 1791 he was appointed conductor of the opera, Prague, and he officiated there for many years, during which time several of his own works met with success.
He was a friend of the great composer during his residence in Prague, and at the first performance of Don Giovanni, October 29, 1787, Kucharz played the mandolin in the orchestra, accompanying the serenade Deli Vieni, while Mozart conducted.
Bone called Kuchař "a consummate artist on the mandolin and an esteemed teacher" and said his pupils numbered many of the most aristocratic members of society.