Jean Jules Aimable Roger-Ducasse (Bordeaux, 18 April 1873 – Le Taillan-Médoc (Gironde), 19 July 1954) was a French composer.
Jean Roger-Ducasse studied at the Paris Conservatoire with Émile Pessard and André Gedalge, and was the star pupil and close friend of Gabriel Fauré.
His personal style was firmly rooted in the French school of orchestration, in an unbroken tradition from Hector Berlioz through Camille Saint-Saëns.
Among his notable pupils were Jehan Alain, Claude Arrieu, Sirvart Kalpakyan Karamanuk, Jean-Louis Martinet, and Francis George Scott.
Roger-Ducasse wrote only one work for organ, entitled Pastorale, a masterpiece that has remained popular with performers in the United States, although it is rarely played in France.