Harry Halbreich (February 9, 1931 – June 27, 2016) was a Belgian musicologist. He studied with Arthur Honegger and later with Olivier Messiaen at the Paris Conservatoire. From 1970 to 1976 he was Lecturer (German: Dozent) in Musical Analysis at the Royal Conservatory in Mons. He worked on numerous radio broadcasts and co-founded the Belgian music magazine Crescendo for which he has been major contributor. He died on 27 June 2016 at the age of 85.