"How Long Will I Love You?" is a song by folk-rock band The Waterboys from their fifth studio album, Room to Roam (1990). Written by Mike Scott, it was released as the album's lead single. The song was subsequently covered by English singer Ellie Goulding and released as the second single from her album Halcyon Days (2013). Goulding's version is included on the soundtrack to the 2013 film About Time, which also features a different cover by Jon Boden, Sam Sweeney and Ben Coleman.

"How Long Will I Love You" was covered by English singer and songwriter Ellie Goulding for Halcyon Days (2013), the reissue of her second studio album, Halcyon (2012). The song was released on 10 November 2013 as the second single from the reissue, also serving as the official song for BBC Children in Need 2013 appeal. It is also included on the soundtrack to the 2013 Richard Curtis film About Time, although her version is not featured in the film itself.

Goulding performed "How Long Will I Love You" live in the BBC Children in Need Appeal Show on BBC One on 15 November 2013.

"How Long Will I Love You" debuted at number 192 on the UK Singles Chart for the week ending 7 September 2013. On the chart dated 23 November 2013, the song jumped from number 117 to its peak position of number three, selling 82,872 copies.

The music video for "How Long Will I Love You" was directed by Mike Sharpe and released on 9 September 2013. The video shows Goulding walking along a beach, intercut with footage from About Time.

A second music video premiered on Goulding's official Vevo channel on 28 October 2013, and contains scenes from the short film Tom & Issy, directed by Roger Michell and starring Goulding and Dylan Edwards. The video was shot entirely on a Nokia Lumia 1020.

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