"Xanadu" is the title song from the soundtrack of the 1980 musical film of the same name. Written by Jeff Lynne of the English rock band Electric Light Orchestra (ELO), the song is performed by English-born Australian singer, songwriter and actress Olivia Newton-John, with Lynne adding parenthetic vocals in the style of his other songs on the Xanadu soundtrack, and ELO providing the instrumentation. It was Lynne's least favourite of his own songs.^{[1][failed verification]} Released as a single in June 1980, it reached number one in several European countries and was the band's only UK number-one single when it peaked there for two weeks in July 1980.^[2] It was certified silver by the British Phonographic Industry.^[3] It also peaked at number eight on the US Billboard Hot 100.^[4]

Sung by Newton-John^[5] as the film's main female character Kira, it peaked at number one in Austria, Belgium, Ireland, the Netherlands, Norway, Spain, the United Kingdom and West Germany.

Billboard′s reviewer described the song as a "sizzling track", writing: "Essentially it's Olivia taking Jeff Lynne's usual spot as lead singer of ELO. The combination is a winning one".^[7]

• Olivia Newton-John – lead and backing vocals
• Jeff Lynne – guitars, keyboards, backing vocals
• Bev Bevan – drums, percussion
• Richard Tandy – keyboards
• Kelly Groucutt – bass guitar, backing vocals
• James Newton Howard – synthesizers
• Louis Clark – strings

In late 1995, two Australian dance performers released two versions of the song. Sydney singer Olivia featuring Paula (on the MDS label) released a dance version first, followed by Kirsty K. (on Central Station Records). Both versions charted on the ARIA Singles and Dance Charts in the first half of 1996.^[37]

In 2000, ELO's Jeff Lynne re-recorded the song, with his own vocals, for the box set Flashback and the All Over the World compilation. Though it was billed as an ELO selection, the song was recorded by Lynne with Marc Mann on keyboards, but without input from his former bandmates Richard Tandy, Bev Bevan and Kelly Groucutt.

In 2009, Scottish singer-songwriter Sharleen Spiteri recorded the song for her second studio album titled The Movie Songbook which was released on 1 March 2010 worldwide. "Xanadu" was released as the lead single from the album in February 2010.