Susan Janet Ballion, known professionally as Siouxsie Sioux (pronunciation: /ˈsuːzi ˈsuː/; born 27 May 1957 in Chislehurst, UK), is an English singer, songwriter, musician and producer.

She is best known as the lead singer of the alternative rock band Siouxsie & The Banshees (1976–1996) and the drums-and-voice duo The Creatures (1981–2005). Siouxsie and the Banshees released 11 studio albums and several UK Top 20 singles including Hong Kong Garden, Happy House, Peek-a-Boo, plus a US Billboard Top 25 hit Kiss Them for Me.

With the Creatures, Siouxsie recorded four studio albums and the hit single Right Now. She has also sung with artists such as Morrissey and John Cale. After disbanding the Creatures in the mid-2000s, she has continued as a solo artist, using the name Siouxsie, and released Mantaray in 2007.