"Lights" is a song by English singer and songwriter Ellie Goulding from Bright Lights (2010), the reissue of her debut studio album, Lights (2010). Written by Goulding, Richard Stannard and Ash Howes, the song was inspired by Goulding's childhood fear of the dark. It was released on 13 March 2011 as the album's sixth single overall, and second from Bright Lights. Originally a bonus track on the UK and German iTunes edition of Lights, the song was re-edited for inclusion on Bright Lights in late 2010, serving as the single version.

"Lights" received positive reviews from most music critics, who praised the song's production and Goulding's "ethereal" vocals. The song was also a commercial success, reaching the top 20 in several countries. In the United States, "Lights" was a sleeper hit, reaching number two on the Billboard Hot 100 after 33 weeks on the chart, and becoming one of the few songs to have spent more than a year on the Hot 100. The song has been certified five-times platinum by the Recording Industry Association of America (RIAA).

"Lights" was originally announced as a single on 8 September 2010 on Goulding's official Twitter page, with a release date scheduled for 1 November 2010. It was to be released as the lead single from the album's repackaging as Bright Lights. However, this plan was scrapped in favour of releasing "Your Song" in order to capitalise on the John Lewis Christmas advert that it was featured in. This was followed by the reissue of the album Lights as Bright Lights.

It was once again announced in January 2011 that the single version of "Lights" would be released. A digital EP was released in the UK on 13 March 2011, containing Goulding's acoustic cover version of Rihanna's "Only Girl (in the World)" as performed on BBC Radio 1's Live Lounge on 10 December 2010.

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