Sugababes (also known as Mutya Keisha Siobhán in 2011–2019) are a British girl group composed of Mutya Buena, Keisha Buchanan and Siobhán Donaghy. The lineup changed three times before returning to the original lineup in 2011.

Formed in 1998 by All Saints manager Ron Tom, Sugababes released their debut album One Touch through London Records in November 2000, which achieved moderate success and produced the top-ten single "Overload". In 2001, Donaghy departed the group and was replaced by Heidi Range. With Range's introduction, the group experienced a higher level of commercial success and went on to release three multi-platinum albums: Angels with Dirty Faces (2002), Three (2003) and Taller in More Ways (2005). In December 2005, Buena left the group and was replaced by Amelle Berrabah. Following the release of their first greatest hits album, the new line-up released two further studio albums: Change (2007) and Catfights and Spotlights (2008).

In September 2009, after 11 years in Sugababes, Buchanan, the final original member, was replaced by Jade Ewen. Range, Berrabah and Ewen released the group's seventh studio album, Sweet 7 (2010), after which they signed to RCA Records, before taking an indefinite hiatus in 2011. That year, the original lineup reformed as Mutya Keisha Siobhan and released the single "Flatline". The trio regained the name Sugababes in 2019, and recorded a rendition of the song "Flowers" with DJ Spoony. In 2021, the Sugababes re-released their debut album One Touch in honor of the album's 20th anniversary, with plans for new music.

Sugababes have achieved six number-one singles: "Freak like Me", "Round Round", "Hole in the Head", "Push the Button", "Walk This Way" and "About You Now"; the Spice Girls are the only British girl group to have had more. They have also released five UK top ten albums, four of which were certified Platinum in the UK, and have been nominated for six Brit Awards, winning for Best British Dance Act in 2003. They have been a long-term fixture in the British tabloids due to their several line-up changes and alleged group infighting.