The Chelsea F.C. won competitions.
Chelsea F.C. . 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 . Chelsea are the only London club to win the UEFA Champions League , and one of five clubs to have won all three main UEFA club competitions , first English to do so .