"The Fly" is a song by Irish rock band U2. It is the seventh track from their 1991 album, Achtung Baby, and it was released as the album's first single on 21 October 1991. "The Fly" introduced a more abrasive sounding U2, as the song featured danceable hip-hop beats, industrial textures, distorted vocals, and an elaborate guitar solo. Lead vocalist Bono described the song as "the sound of four men chopping down The Joshua Tree," due to its departure from the traditional sound that had characterised the band in the 1980s.

Bono described the song's subject as that of a phone call from someone in Hell who enjoys being there and telling the person on the other end of the line what he has learned. The lyrics are written as a series of aphorisms that Bono collected during the album's recording. The song and its video were also a showcase for "The Fly," a persona that Bono adopted for the Zoo TV Tour, in which he played the part of a stereotypical leather-clad rock star known for wearing large wrap-around sunglasses and strutting around the stage. The song became the band's second number-one single in the UK and was successful among alternative rock radio audiences.

The writing of "The Fly" began during recording sessions for Achtung Baby at Berlin's Hansa Studios in 1990. The song's origins can be traced to a demo recorded there, which eventually evolved into the B-side "Lady With the Spinning Head." The demo was among the material that was bootlegged from the Berlin sessions and released as Salome: The Axtung Beibi Sessions. In 1991, the album's recording sessions moved to the seaside mansion "Elsinore" in Dalkey, where the group continued to work on the demo. It was troublesome, but it inspired portions of three separate songs, "The Fly" being one of them, and "Ultraviolet (Light My Way)" and "Zoo Station" being the other two. Lead vocalist Bono stated, "One day, [engineer] Flood had a different look in his eye. It started to feel good. We recorded 'The Fly'. Edge's guitar sound was literally like a fly had broken into your brain and was buzzing around."

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