"Killer" is a song by British acid house producer Adamski. Written by Adamski and Seal and produced by Adamski, "Killer" was Adamski's breakthrough single, but is now more notable for featuring Seal as a vocalist. A major hit in the UK, it reached number one, spending four weeks at the top of the chart in May and June 1990. In total, the single sold over 400,000 copies in the UK, earning it a BPI Gold certification.

Lyrically, the title of the song comes from the line "It's the loneliness that's the killer," which occurs only once in the introduction to the Seal version and not at all in the Adamski version. The distinctive opening bassline and keyboard melody during the chorus, however, are preserved in almost every version of the song in some form.

The song also contains the lyrics "Racism in amongst future kings can only lead to no good, and besides, all our sons and daughters already know how that feels", which were reused in Seal's song "Future Love Paradise" featured on his debut album. "Killer" was featured in the film Miami Twice based on the TV series Only Fools and Horses.

In 1991, Seal re-recorded "Killer" for his eponymous debut album, produced by Trevor Horn. The single release of Seal's version peaked at #8 in the UK, squeezed onto the Billboard Hot 100 at #100 and peaked at #9 on the Billboard Hot Dance Club Play chart with a remix by William Orbit.

The music video for this version used computer-generated science-fiction themed imagery, largely built around a partial re-creation of the M. C. Escher print Another World. The video was produced and directed by Don Searll. The song won Best British Video at the 1992 Brit Awards.

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