"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.
Chelsea Dagger was ranked "best goal song in NHL" by Sports Illustrated. It is currently the celebratory song of the NHL's Chicago Blackhawks.
"We were searching for a new goal song at the start of the 2008-09 season," Executive Producer of Blackhawks Hockey (Tom O'Grady) said, "then we found Chelsea Dagger which has a very contagious organic sound, and I felt the song would catch on once Blackhawks fans became accustomed to hearing it." Seven years later, Chelsea Dagger has become the unofficial Chicago Blackhawks team anthem.