Gabriel Díaz Bessón (1590 - November 6, 1638) was a Spanish composer.
Díaz Bessón was born in Alcalá de Henares and became maestro de capilla of the Royal Convent of La Encarnación, Madrid; as capellán for Francisco Gómez de Sandoval y Rojas, Duke of Lerma, the favourite of Philip III of Spain at the Church of Saint Peter at the Colegiata de Lerma, Burgos (1616). On the accession of Philip IV of Spain in 1621 Díaz Bessón was capellán at Granada Cathedral, then at Córdoba (1624-1631), and finally at the Convent of Las Descalzas Reales, Madrid. Dates overlap since he was concurrently maestro de la Real Capilla in Madrid and titular maestro de capilla of various cathedrals. In 1628 he was succeeded as maestro de capilla of the Royal Convent of La Encarnación in Madrid by Carlos Patiño who was then, five years later in 1634, chosen ahead of Díaz Bessón to succeed the Flemish-born Mateo Romero as the first Spanish-born maestro of the Flemish chapel (capilla flamenca). Díaz Bessón died four years later in Madrid.
Díaz Bessón "wrote music that was apostrophised as 'celestial'". Díaz Bessón composed in all the major genres: masses, requiem, motets, psalms, antiphons, hymns, tonos humanos, villancicos. In all more than 700 compositions were recorded, almost all of which were lost in the 1755 Lisbon earthquake, as well as writing theoretical works.