Jukka Santeri Tiensuu (born 30 August 1948) is a Finnish contemporary classical composer, harpsichordist, pianist and conductor.
at the Sibelius Academy, Helsinki (1967–1972), the Juilliard School, New York (1972–1973), Hochschule für Musik Freiburg (1974–1976), IRCAM, Paris (1978–1982) and other institutes Jukka Tiensuu toured three continents giving numerous concerts with a wide repertoire ranging from the Renaissance to the latest avant-garde and performing both classical and free improvisations.
According to the jury report his "compositions emanate a deep spirituality, and his unwavering adherence to artistic goals is impressive".
His compositions have been premiered by major orchestras and ensembles in three continents by conductors such as Susanna Mälkki, Ernest Bour, Sakari Oramo, Jukka-Pekka Saraste, Lorraine Vaillancourt, Diego Masson, Ilan Volkov, Leif Segerstam, Jacek Kaspszyk, John Storgårds, Hannu Lintu, Dima Slobodeniuk, Yan Huichang, Juha Kangas, Jacques Mercier, Stefan Asbury, among others.
In the late 70's, as the president of the ISCM Finnish Section, Tiensuu started the first ever regular contemporary music concert series in Helsinki.