Henrik Otto Donner (16 November 1939 – 26 June 2013) was a Finnish composer, musician and all-round music personality. His musical styles varied from pop and rock music to jazz, electronic music and contemporary classical music. Donner's personal instrument was trumpet. He was a member of the famous Finland Swedish Donner family.
Donner was one of the pioneers of Finnish avant-garde and experimental music as well as an important figure in Finnish left-wing "song movement" of the 1960s and 1970s. He studied at the Sibelius Academy in Helsinki and later in Vienna as a student of György Ligeti. In 1966 Donner was one of the founders of record label Love Records which was a pioneering label in Finnish rock music. Donner collaborated with many Finnish musicians and artists such as Erkki Kurenniemi, Juhani Aaltonen, A. W. Yrjänä, Hasse Walli and Dave Lindholm. He was a film score composer for more than 50 movies and TV-series.
Henrik Otto Donner was found dead at the marina of Jakobstad early in 27 June 2013. It is yet uncertain whether he was drowned or died of a heart attack.