"Halo of Flies" is a 1973 single by rock band Alice Cooper taken from their 1971 album Killer. The single was only released in the Netherlands, two years after the song appeared on the album. 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 organisation.