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Chelsea Football Club logo on wooden background.

Chelsea Football Club is an English professional football club based in Fulham, West London. Founded in 1905, the club competes in the Premier League, the top division of English football. Domestically, the club has won six league titles, eight FA Cups, five League Cups, and four FA Community Shields. Internationally, they have won two European Cups, two UEFA Cup Winners' Cups, two UEFA Cups, two UEFA Super Cups, and one FIFA Club World Cup. In terms of overall trophies won, it is the fourth-most successful club in English football.

Since their inception in 1905, they have played at their home ground, Stamford Bridge. Chelsea won their first major honour, the League championship, in 1955. The club won the FA Cup for the first time in 1970 and their first European honour, the Cup Winners' Cup, in 1971. After a period of downtrend in the late 1970s and 1980s, the club enjoyed a revival in the 1990s, enjoying more success in several cup competitions. The past twenty-five years have been the most successful in Chelsea's history: they have won five Premier League titles, seven FA Cups, four League Cups, two UEFA Champions League titles, two UEFA Europa League titles, two UEFA Super Cups, and one FIFA Club World Cup during this period. Chelsea are one of five clubs to have won all three of UEFA's main club competitions, being the first English club to achieve the UEFA treble, and the only club to have won all three major European competitions twice. They are also the only London club to have won the Champions League and the Club World Cup.

Chelsea's home kit colours are royal blue shirts and shorts with white socks. The club's crest features a ceremonial lion rampant regardant holding a staff. The club has rivalries with neighbouring teams Arsenal and Tottenham Hotspur, and a historic rivalry with Leeds United. Based on attendance figures, the club has the sixth-largest fanbase in England. In terms of club value, Chelsea are the seventh most valuable football club in the world (as of 2021), worth £2.39 billion ($3.2 billion), and are the eighth highest-earning football club in the world, with earnings of over €469 million in the 2019–20 season. Since 2003, Chelsea F.C. has been owned by Russian oligarch Roman Abramovich, who was disqualified as a director of the club in March 2022 following him being sanctioned by the UK government.