"About You Now" is a song by British girl group Sugababes from their fifth studio album, Change (2007). Written and produced by Dr. Luke along with Cathy Dennis and Steven Wolf, it was released on 24 September 2007 by Island Records as the lead single from the album, the first to feature Amelle Berrabah on all tracks. An uptempo pop track that combines heavy elements of pop rock, and dance-pop, it infuses light electronic sounds. Lyrically, "About You Now" finds the protagonist thinking deeply over her relationship with her love interest from whom she parted.

The song was generally well received by music critics, who complimented its genre mixing production as well as its aurally remarkable US pop influence. Some of them also described the song as a "pop-electro-rock masterpiece" and called it the best Sugababes single in years. Upon its release, "About You Now" became the group's sixth UK number one hit and highest-charting single since 2005's "Push the Button." It remained atop the UK Singles Chart for four weeks. It also reached the top of the charts in Hungary, as well as the top ten in Austria, Belgium, Germany, Ireland, Norway, and Spain. The Sugababes' highest-selling single to date, it has sold 540,500 copies as of October 2015.

"About You Now" was nominated for a 2008 BRIT Award for Best British Single. In the 2009 edition of Guinness World Records, "About You Now" was listed as the "first track by a British pop act to top the singles chart solely on downloads". The song was also named as the "biggest chart mover to the number one position in the UK". In December 2009, it was revealed by BBC that "About You Now" was the UK's fifth most-played song of the decade (2000–09). An acoustic version of the song appears as a bonus track on the group's sixth studio album Catfights and Spotlights (2008).

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