Joan Massià i Prats (Barcelona, 22 February 1890 - 11 June 1969) was a Catalan composer and violinist.
His first wife was the pianist and student of d'Indy, Blanche Selva (1884-1942), with whom Massià recorded the Franck violin sonata and other works.
After her death he remarried; his second wife was the Spanish pianist María Carbonell (1911-1988).
His students included the violinist Gonçal Comellas.