Once Upon a Time: The Singles is Siouxsie and the Banshees's 1981 compilation album featuring the band's UK single releases to date. The album featured several songs that had been released as singles yet had not appeared on any of the Banshees' four albums. Once Upon a Time: The Singles spent twenty six weeks in the UK albums chart.
Allmusic's Steve Huey called the compilation "a cohesive and essential overview of the band's edgy, influential peak." He added that despite the group's "challenging" music, "it's also accessible enough for eight of these singles to have charted in the British Top 50." Mark Tremblay of the Calgary Herald wrote that "only 'Playground Twist' really excels from the first side", which features the band's singles prior to 1980. Tremblay said "Side two is more polished, less abrasive and generally has better rhythmic drive." In 2002, Q Magazine named Once Upon A Time: The Singles the 7th Greatest Album of All-Time by a Female Artist. In 2012, Rolling Stone ranked the album 44th on its "Women Who Rock: The 50 Greatest Albums of All Time" list.