Chelsea F.C. has won a championship.
Chelsea Football Club ( [ ˈtʃɛlsiː ] ) is an English professional football club based in Fulham , London , that competes in the Premier League , of which they are reigning champions . Chelsea had their first major success in 1955 , when they won the league championship . They then won various cup competitions between 1965 and 1971 . Chelsea have won six national league titles , seven FA Cups , five League Cups and four FA Community Shields , one UEFA Champions League , two UEFA Cup Winners ' Cups , one UEFA Europa League and one UEFA Super Cup .