"Too Lost in You" is a song by English girl group Sugababes, from their third studio album Three (2003). It was written by American songwriter Diane Warren as an English rendition of the song "Quand j'ai peur de tout" by French singer Patricia Kaas (which had lyrics in French by Jean-Jacques Goldman). The song was produced by the Australian musician Rob Dougan in collaboration with Andy Bradfield, and recorded at the Realsongs studio in Hollywood. "Too Lost in You" is prominently featured in the soundtrack to the 2003 film Love Actually, and was chosen for the film specifically by its director Richard Curtis. It is a pop and R&B ballad composed of an orchestral music arrangement and dark harmonies.

"Too Lost in You" was released in the United Kingdom on 15 December 2003 as the album's second single. It received favourable reviews from most critics, who commended the Sugababes' performance and considered it one of the best pop singles of the 2000s. The song was commercially successful worldwide, and reached the top ten on the singles charts of the Netherlands, Norway, Switzerland and the United Kingdom. A music video for the single was directed by Andy Morahan and filmed at London Stansted Airport over a two-day period. It features each member of the Sugababes with a man from the airport. Since its release, "Too Lost in You" has become a staple of the group's live performances, and was included in the set lists for their tours in support of Taller in More Ways (2005), Overloaded: The Singles Collection (2006) and Change (2007).

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