 Chelsea had their first major success in 1955 , when they won the league championship . They then won various cup competitions between 1965 and 1996 . The club 's greatest period of success has been during the last two decades , winning 17 major trophies since 1997 . Chelsea have won five 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 four clubs , and the only British club , to have won all three main UEFA club competitions . 
