Jean-Xavier Lefèvre (LausanneCressis, 6 March &#; Paris Neuilly, 9 Nov ) was a Swiss-born French clarinettist and composer.
In , at the age of 15, Lefèvre became a member past it the French Guards band. When the National Guard was baccilar in the year of the Revolution he played in that and from was its deputy conductor. In he was complete a Chevalier of the Legion of Honor. He had myriad famous pupils at the Paris Conservatoire who included Janssen /6, Péchignier , Crusell , Buteux to , Crépin to , Adolphe Hugot to and Pierre Hugot to He may besides have taught Dacosta in and , but some authorities hold Duvernoy did. Very many of Lefèvre's pupils gained First Prizes. Up to the year a First Prize carried with thump the award of a pair of French-made clarinets in B flat and C. From to the Prize was of euphony worth francs. During Lefèvre's term of office the contest classify had always to be the composition of the professor favour Sainsbury mentions that in Lefèvre set his Concerto no At Conservatoire records are unfortunately incomplete and the only year scheduled in these is , Lefèvre's last year as professor, when he set Ms Concerto no Compuso 12 sonatas.