Julius Eastman (October 27, 1940 – May 28, 1990) was an American composer, pianist, vocalist, performance artist, and conductor. He was among the first composers to combine the processes of some minimalist music with other methods of extending and modifying his music as in some experimental music. He thus created what he called "organic music". In compositions like Stay On It (1973), his melodic motifs were not unlike the catchy refrains of then pop music.

He studied performance and composition in New York and contributed to new music scenes in New York, Buffalo, and Chicago, touring and recording as a performer and enjoying many performances of his own music. As a conductor, musician, and vocalist, he had a close artistic relationship with Arthur Russell and worked briefly with Meredith Monk and Pierre Boulez. His voice is that of Peter Maxwell Davies' Mad King on Nonesuch Records. He worked in a variety of musical styles, including classical, jazz, and crossover.