Jon Hassell (born March 22, 1937) is an American trumpet player and composer. He is known for developing the musical aesthetic known as "Fourth World," which unifies ideas from minimalism, various world music sources, and his unusual electronic manipulation of the trumpet. He has collaborated with artists such as Brian Eno, La Monte Young, Terry Riley, Talking Heads, Farafina, Peter Gabriel, Ani DiFranco, and Ry Cooder.