Eilert Ove "Eje" Thelin (9 June 1938 – 18 May 1990)[1] was a Swedish jazz trombonist.

Thelin, who was self-taught as a musician, started playing with the dixieland group Pygmé Jazz Band, and later joined the sextet of Putte Wickman.

[1] Disillusioned with the Swedish jazz scene,[3] Thelin moved to Austria in 1968, where he taught at the Academy of Music in Graz,[1] while also performing free improvised music with a group led by himself and Joachim Kühn in several European countries.

[2] After returning to Stockholm in 1972, he led his own Eje Thelin Group in Sweden for the rest of the 1970's,[1] moving towards jazz fusion and experimenting with electronics.

[3] During his career, Thelin performed and collaborated with Roy Brooks, Graham Collier, Palle Danielsson, Joe Harris, Joachim Kühn, Evan Parker, George Russell, John Surman and Kenny Wheeler.