Claim: The Chelsea F.C. won various cup competitions between 1965 and 1971.

Chelsea Football Club -LRB- -LSB- ˈtʃɛlsiː -RSB- -RRB- is an English professional football club based in Fulham , London , that competes in the Premier League , of which they are reigning champions . Founded in 1905 , the club 's home ground since then has been Stamford Bridge .   Chelsea had their first major success in 1955 , when they won the league championship . They then won various cup competitions between 1965 and 1971 . The club 's greatest period of success has come during the last two decades ; winning 18 major trophies since 1997 . 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 .   Chelsea 's regular kit colours are royal blue shirts and shorts with white socks . The club 's crest has been changed several times in attempts to re-brand the club and modernise its image . The current crest , featuring a ceremonial lion rampant regardant holding a staff , is a modification of the one introduced in the early 1950s . The club have the sixth-highest average all-time attendance in English football . Their average home gate for the 2016 -- 17 season was 41,507 , the sixth highest in the Premier League . Since 2003 , Chelsea have been owned by Russian billionaire Roman Abramovich . In 2016 , they were ranked by Forbes magazine as the seventh most valuable football club in the world , at # 1.15 billion -LRB- $ 1.66 billion -RRB- .