"Lost!" is a song by English alternative rock band Coldplay, and is the third track and third single on the band's 2008 album Viva la Vida or Death and All His Friends. "Lost!" was released as a promotional single in September 2008 and will be released as a four-track, download-only EP in November 2008.
Upon the release of Viva la Vida or Death and All His Friends Coldplay revealed that "Sing", from Blur's 1991 debut album Leisure, was a source of inspiration in having provided a starting point for "Lost!".