Jukka Tiensuu (born 30 August 1948 in Helsinki) is a Finnish contemporary classical composer, harpsichordist, pianist and conductor. His repertoire as musician ranges from baroque music to John Cage and free improvisation and he has given master classes in baroque performance practice and free improvisation. He has written as well electroacoustic music as works for jazz ensemble, baroque music ensemble, large orchestra, ensemble or solo instruments, such as the Finnish instrument kantele. Jukka Tiensuu has studied in Freiburg, Helsinki, and New York City.