William Masselos (August 11, 1920 – October 23, 1992) was an American classical pianist. 　　William Masselos was born in Niagara Falls, New York to a Dutch mother and a Greek father. He made his New York debut at The Town Hall in 1938 at the age of 18. 　　He studied with Carl Friedberg, a disciple of Johannes Brahms and Clara Schumann, and also with Nelly Reuschel (another Clara Schumann disciple) at New York's Institute of Musical Art (later called Juilliard School).