Robert Casadesus (7 April 1899 – 19 September 1972) was a renowned 20th-century French pianist and composer. He was the most prominent member of a famous musical family, being the nephew of Henri Casadesus and Marius Casadesus, husband of Gaby Casadesus, and father of Jean Casadesus. The preferred pronunciation of his last name is "Kah-zah-deh-su" with a silent final "s."