"Would I Lie to You?" is a 1985 song written and recorded by the British pop duo Eurythmics. Released as the lead single from the band's fourth studio album Be Yourself Tonight, the song was the first by the duo to feature their change in musical direction from a predominantly synthpop style to rock and rhythm and blues. The song, and its accompanying album, featured a full backing band and relied less on electronic programming.

Lyrically, the song features Lennox confronting a cheating lover as she leaves him for good. This was conveyed in the music video for the single, in which actor Steven Bauer played the part of the boyfriend. The video was directed by Mary Lambert and was shown heavily on MTV. The front and back cover photos, and the inner cover art of the Be Yourself Tonight album are screenshots from the music video.

"Would I Lie to You?" is one of Eurythmics' most recognised tunes and continued the band's run of hit singles. In the UK, the song peaked at number 17, while it went to number five on the U.S. Billboard Hot 100, becoming their third Top 10 hit in the U.S. Furthermore, it is the duo's biggest ever hit in Australia, where it topped the singles chart for two weeks.

It was used in the trailer for the film Liar Liar. This song is featured in the 2009 film The Informant! starring Matt Damon, and as the theme song to the 2012 TV series Border Security: Canada's Front Line. It is also featured in the 1986 film One Crazy Summer with John Cusack.

* this version although labelled as "LP Version" is an alternate mix of the song released on the album Be Yourself Tonight

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