Renaud Gagneux (born 15 May 1947 in Paris) is a French composer.

At the École Normale in Paris, Renaud Gagneux studied piano with Alfred Cortot and composition with Henri Dutilleux. In 1966 he went to Cologne to study composition with Karlheinz Stockhausen, then with André Jolivet and Olivier Messiaen at the Paris Conservatory, where he won first prize in composition in 1972 (Weid 2001). In 1972 he joined the Groupe de Recherches Musicales de l'ORTF. His numerous prizes include the Sacem Grand Prix for chamber music (1977), the Prix Georges Enesco (1983), the Prize for New Talent from the SACD (1989), the Composers' Prize of the Sacem (1990), and the SACEM Grand Prix 1993 for his works overall.