Marcello Giordani (born Marcello Guagliardo; 25 January 1963 – 5 October 2019) was an Italian operatic tenor who sang leading roles of the Italian and French repertoire in opera houses throughout Europe and the United States. He had a distinguished association with the New York Metropolitan Opera, where he sang in over 240 performances from the time of his debut there in 1993. He founded the Marcello Giordani Foundation to help young opera singers.