Costin Miereanu (born 27 February 1943) is a French composer and musicologist of Romanian birth.
Miereanu was born in Bucharest and studied at the Music Academy there from 1960 to 1966 with Alfred Mendelsohn, Tiberiu Ola, Ștefan Niculescu, Dan Constantinescu, Myriam Marbe, Aurel Stroe, Anton Vieru, and Octavian Lazăr Cosma, and later at the École des Hautes Études et Sciences Sociales, at the Schola Cantorum, and at Paris 8 University Vincennes-Saint-Denis, where he was awarded first prizes in writing, analysis, music history, esthetics, orchestration, and composition) and earned a Doctor of Letters and a Doctor of Musical Semiotics.
Between 1967 and 1969, he was a student of Karlheinz Stockhausen, György Ligeti, and Ehrhard Karkoschka at the Internationale Ferienkurse für neue Musik in Darmstadt.
Miereanu evolved his compositional style featuring a sensuous sonic fabric by combining of Erik Satie's techniques with an abstraction of Romanian traditional music.
Miereanu has composed aleatoric works, compositions in the style of musique concrète, music for orchestra and chamber orchestra, often using pre-recorded tape material, as well as music for theatre.