William Orbit (born on 15 December 1956, as William Mark Wainwright) is a British musician and record producer, best known to the public for producing Madonna's album Ray of Light, which received four Grammy Awards. He has also co-produced several unreleased Madonna songs originally recorded for other albums that were never used. Also, he produced "13" by Blur, and remixed some of the songs on the album.

His speciality is atmospheric keyboard electronica although much of his work features accomplished guitar playing.