"It's a Sin" is a song by English synth-pop duo Pet Shop Boys from their second studio album, Actually (1987). Written by Chris Lowe and Neil Tennant, the song was released on 15 June 1987 as the album's lead single. It became the duo's second number-one single on the UK Singles Chart, spending three weeks atop the chart. Additionally, the single topped the charts in Austria, Denmark, Finland, Germany, Ireland, Norway, Portugal, Spain, Sweden and Switzerland, while reaching number nine on the US Billboard Hot 100.

It's a Sin is a British drama television miniseries written by Russell T Davies. Set in London between 1981 and 1991, it depicts the lives of a group of gay men and their friends during the HIV/AIDS crisis in the United Kingdom. It's a Sin features a main cast consisting of Olly Alexander, Omari Douglas, Callum Scott Howells, Lydia West, and Nathaniel Curtis. Other actors cast were David Carlyle, Keeley Hawes, Shaun Dooley, Tracy Ann Oberman, Neil Patrick Harris and Stephen Fry. The series was directed by Peter Hoar, produced by Red Production Company, and premiered in the United Kingdom on Channel 4 on 22 January 2021.