"Jealousy" is a song originally written in 1982 by the Pet Shop Boys, recorded for their 1990 album Behaviour. In 1991, it was released in a slightly remixed form as a single, which appears on both Pet Shop Boys' greatest hits albums. It has also been covered by the British band Dubstar, and was sung by Robbie Williams at the 2006 Pet Shop Boys' BBC Radio 2 concert at the Mermaid Theatre, a recording of which was released on the Pet Shop Boys' live album Concrete.