Mikko Kyösti Heiniö (born 18 May 1948) is a Finnish composer and musicologist.Mikko Heiniö was born in 1948 in Tampere, and studied composition with Joonas Kokkonen and piano with Liisa Pohjola at the Sibelius Academy in Helsinki from 1971 to 1975, and then studied composition with Witold Szalonek in West Berlin from 1975–77 while at the same time beginning studies in musicology at the University of Helsinki. He earned a diploma in composition from the Sibelius Academy in 1977, and a doctorate in musicology in 1984 from the University of Helsinki, where he lectured between 1977 and 1985 (Murtomäki 2001). He was appointed professor of musicology at the University of Turku in 1986–2005 and he is composer-in-residence of the Turku Philharmonic Orchestra since 1997. Heiniö has been a member of the Board of Teosto (the Finnish Composers’ Copyright Bureau) and he has served as Chairman of the Society of Finnish Composers in 1992–2010.