Leonardo Ortensio Salvatore de Leo (1694–1744) was an Italian composer and violinist, primarily associated with the Baroque music genre. Born in Naples, he is best known for his contributions to instrumental music, particularly in the realm of chamber music and the concerto. De Leo's notable works include a series of violin sonatas and concertos, which reflect the virtuosic style characteristic of the Baroque period. His compositions often feature intricate melodies and elaborate ornamentation, showcasing his skill as a performer and composer. De Leo's impact on music is evident in his influence on the development of the Neapolitan school of composition, which emphasized melodic richness and emotional expression. His works were performed by contemporaneous musicians and contributed to the evolving landscape of Baroque music in Italy. While not as widely recognized today as his contemporaries such as Vivaldi or Corelli, de Leo's compositions are appreciated for their craftsmanship and have gained attention in recent years through historical performance practices. His music exemplifies the transition between the late Baroque and early Classical styles, making him a significant figure in the history of Western classical music.