Steven John Wilson (born 3 November 1967) is an English musician. He is the founder, guitarist, lead vocalist and songwriter of the rock band Porcupine Tree, as well as being a member of several other bands, including Blackfield, Storm Corrosion and No-Man. He is also a solo artist, having released seven solo albums since his solo debut Insurgentes in 2008. In a career spanning more than 30 years, Wilson has made music prolifically and earned critical acclaim. His honours include six nominations for Grammy Awards: twice with Porcupine Tree, once with his collaborative band Storm Corrosion and three times as a solo artist. In 2017, The Daily Telegraph described him as "a resolutely independent artist" and "probably the most successful British artist you've never heard of".

Wilson is a self-taught composer, producer, audio engineer, guitar and keyboard player, and plays other instruments as needed, including bass guitar, autoharp, hammered dulcimer and flute. His influences and work have encompassed a diverse range of genres including pop, psychedelia, progressive rock and electronic, among others, shifting his musical direction through his albums. His concerts incorporate quadraphonic sound and elaborate visuals. He has worked with artists such as Elton John, Guns N' Roses, XTC, Opeth, Pendulum, Yes, Fish, Marillion, Black Sabbath, and Anathema. He has remixed several classic pop and rock records, such as Tears for Fears' Songs from the Big Chair and The Seeds of Love, Ultravox's Vienna, Jethro Tull's Aqualung, King Crimson's In the Court of the Crimson King, and Roxy Music's self-titled debut album.

Wilson released his sixth solo album, The Future Bites, on 29 January 2021. A limited edition of a single copy of the album sold on pre-order immediately for £10,000 on Black Friday in November 2020, with all proceeds going to Music Venue Trust to help save UK music venues affected by the COVID-19 pandemic. The Future Bites 30-track Digital Deluxe version was made available on 27 August 2021, including remixed versions by artists such as Biffy Clyro, Nile Rodgers and Pure Reason Revolution. Wilson's seventh studio album, The Harmony Codex, was released in 29 September 2023.