"It Must Have Been Love" is a song written by Per Gessle and performed by the Swedish pop duo Roxette. The ballad became the duo's third number one hit in the United States, and is one of their best selling releases, being certified gold or platinum in a number of countries.

Four different versions of the song have been officially released. The original 1987 track was followed by the most successful incarnation of the song, a slightly edited version – omitting the Christmas references – which was created for the soundtrack to the 1990 movie Pretty Woman. During the "Join the Joyride! World Tour" in 1991, the band recorded a country music version of the track in Los Angeles, which was included on their 1992 album Tourism. A Spanish-language version of the Pretty Woman recording was released on their 1996 compilation Baladas en español. Finally, an orchestral live performance from the band's 2009 concert at Night of the Proms was included on their 2012 studio album, Travelling.

The song was first released as "It Must Have Been Love (Christmas for the Broken Hearted)" in December 1987. It was composed after EMI Germany asked the duo to "come up with an intelligent Christmas single". It became a top five hit in Sweden, but was not released internationally. This version of the song was never included on any Roxette studio album until the 1997 re-release of their debut Pearls of Passion (1986).

A performance from a Swedish TV chart show in 1987 acted as the song's first music video. It features Fredriksson and Gessle sitting on a couch on a stage, lip-syncing to the song.

All songs written and composed by Per Gessle, except where noted.

During a run of increasingly successful singles from the duo's 1988 album Look Sharp!, Touchstone Pictures approached Roxette and their label about contributing a song to the soundtrack of the upcoming romantic comedy release Pretty Woman, starring Richard Gere and then-Oscar nominee Julia Roberts. The film was released in March 1990 and went on to make more than US$460 million at the worldwide box office. The corresponding soundtrack album was also a commercial success, which was certified triple-platinum in the US. The soundtrack went on to sell more than nine million copies worldwide.

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