Nicolas Flagello (March 15, 1928 – March 16, 1994), was an American composer and conductor of classical music.
Flagello was born in New York City, into a very musical family. His brother Ezio Flagello was a bass who sang at the Metropolitan Opera. One of his first music teachers was the composer Vittorio Giannini, and he then studied at the Manhattan School of Music. In 1955, he went on to the Accademia Nazionale di Santa Cecilia in Rome where he studied with Ildebrando Pizzetti. His music was first recorded in the early 1960s, and he produced a large body of work, reaching the height of his fame with his oratorio, The Passion of Martin Luther King (1968), premiered in 1974. In the mid-1980s, his career was cut short by a degenerative disease. He died in New Rochelle, New York, on March 16, 1994.