Robert Casadesus (April 7, 1899 – September 19, 1972) was a renowned 20th-century French pianist. 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. He was also a composer. Robert Casadesus was born in Paris and studied there at the Conservatoire with Louis Diémer, taking a Premier Prix (First Prize) in 1913 and the Prix Diémer in 1920. Robert then entered the class of Lucien Capet, who had exceptional influence.