Sophie Barker (born November 5, 1971) is a British singer from London, best known for her work with the British downtempo group Zero 7. Barker left University College London after two years to become a full-time singer, signing with Sony Records in 1996 with Kate Holmes (formerly of Frazier Chorus and now with Client) under the name "Sirenes. " Sirènes released three singles, Blind, Deep End, and Sun Don't Shine, before splitting up at the end of 1997. Barker co-wrote Zero 7's biggest hit, "Destiny", and sings the song alongside fellow vocalist Sia Furler. Barker also co-wrote and sang Zero 7 songs such as "In The Waiting Line" on the Zero 7 album Simple Things, which has sold more than one million copies worldwide, and also the song "Spinning". She also contributed to the follow-up Zero 7 album When It Falls, co-writing the songs "Passing By" and "In Time".

Barker collaborated with musician KK in 2004 to release Lullaby, an album of soothing night-time songs for children. That same year, she appeared as a backing vocalist on fellow Zero 7 bandmate's Sia Furler's album Colour the Small One, appearing on the track "Natale's Song". She followed this with a solo album entitled Earthbound, released in 2005. Barker has also worked with The Egg, electronica artists Grooverider and Groove Armada and the acid-jazz duo Muki. Barker was featured in a 2006 British Airways UK television campaign, singing a cover version of John Denver's "Leaving on a Jet Plane". Barker also featured as a guest singer in Quiet Letters by Bliss.