François d'Agincourt (c. 1684–1758) was a French composer and music theorist, known primarily for his contributions to early music and the development of keyboard instruments. He belonged to the Baroque genre, a period characterized by intricate musical forms and expressive styles. D’Agincourt is best known for his collection of harpsichord works, particularly the "Pièces de clavecin" published in 1712. This work showcases his skill in writing for the harpsichord, featuring a blend of French and Italian styles, which was indicative of the transitional phase in Baroque music. His compositions highlight the ornamentation and improvisatory elements that were typical of the time. In addition to his compositions, d'Agincourt made significant contributions to music theory, with writings that explored the principles of harmony and counterpoint. His theoretical works helped lay the groundwork for future developments in Western music. Although not as widely recognized as some of his contemporaries, d'Agincourt's influence can be seen in the evolution of keyboard music and his role in bridging the styles of the late Baroque period. His work remains of interest to musicologists and performers keen on exploring early music repertoire.