"Halo of Flies" is a 1973 single by rock band Alice Cooper taken from their 1971 album Killer.

The song was, according to Cooper's liner notes in the compilation The Definitive Alice Cooper, an attempt by the band to prove that they could perform King Crimson-like progressive rock suites, and was supposedly about a spy organization.

Upon its 1973 single release, the song became a top 10 hit in the Netherlands and also charted in neighboring Belgium because of imports.

The noise rock band Halo of Flies named themselves after this song.

This song was performed live by Tripping Daisy Aug 27, 2022 at the Kessler Theatre as part of a Homage Nation tribute to the Alice Cooper band.