Staffan William-Olsson (born 13 December 1959) is a Swedish jazz guitarist in the band The Real Thing who has worked with Bob Berg, Lee Konitz, and Palle Mikkelborg.

When he discovered jazz-rock, Weather Report, John McLaughlin and Allan Holdsworth among others became the new sources of inspiration.

William-Olsson was after classical piano studies at Göteborg Musikhögskola (he is autodidact guitarist), the replacement for Ulf Wakenius in the Swedish fusion band Hawk on Flight, and also collaborated with such as Bob Berg, Lee Konitz and Palle Mikkelborg.

[1] He moved to Oslo in 1986 and worked as a freelance guitarist before becoming a part of the hard rock band Sons of Angels in 1989.

William-Olsson started the mini big band "Sharp 9" in 2005, inspired by the likes of Art Pepper and Miles Davis.