Gaspar Cassadó i Moreu (30 September 1897 – 24 December 1966) was a Spanish cellist and composer of the early 20th century. He was born in Barcelona to a church musician father and began taking cello lessons at age seven. When he was nine, he played in a recital where Pablo Casals was in the audience; Casals immediately offered to teach him. The city of Barcelona awarded him a scholarship so that he could study with Casals in Paris.

He was also the author of several notable musical hoaxes.

The personal papers of Cassadó family are preserved in the Biblioteca de Catalunya.