"Thorn in My Side" is a 1986 song recorded by British pop music duo Eurythmics. It was released as the second single from the duo's Revenge album. Written by band members Annie Lennox and David A. Stewart, the song is a cast-off to an unfaithful lover. "Thorn in My Side" was produced by Stewart.

Although the first single from Revenge, "When Tomorrow Comes," had barely reached the UK Top 30, "Thorn in My Side" became Eurythmics' ninth Top 10 single, reaching number five in the British charts. To date, it is their last appearance in the UK Top 10. In the United States, the track stalled at number 68 on the Billboard Hot 100. It was a hit in Australia, charting at 12 on the Kent Music Report.

The music video, directed by Chris Ashbrook and Dave Stewart, depicts the band adorned in their black and leather Revenge stage costumes, playing in a studio set bar filled with an audience that includes a gang of Hells Angels. Clem Burke, drummer from the band Blondie, appears in the video as he was recording and touring with Eurythmics that year.

1. LP Version - 4:15 2. Extended Version - 7:00

US 7" B-side: In This Town (LP Version) 3:48

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