"Chelsea Dagger" is a song by Scottish rock band The Fratellis and their second single. It was released on 28 August 2006. It is taken from their debut album Costello Music, which was released in the United Kingdom on 11 September 2006. It is supposed to be named after both Jon Fratelli's wife Heather, a burlesque dancer whose stage name – Chelsea Dagger – he borrowed for the song.
This song was Number 77 on Rolling Stone's list of the 100 Best Songs of 2007.