Chelsea Football Club is a professional football club based in Fulham, West London, England. The club was founded in 1905 and named after neighbouring area Chelsea. They compete in the Premier League, the top tier of English football, playing their home games at Stamford Bridge. Since 2022, the club has been owned by BlueCo.
Chelsea won their first major domestic trophy, the First Division championship, in 1955. They won their first Premier League title in the 2004–05 season under José Mourinho. In total, Chelsea have won six top-flight league titles. They have also won eight FA Cups, five League Cups, and four FA Community Shields, making them the fifth-most successful club in English football.
At international level, Chelsea won their first European trophy in 1971, lifting the Cup Winners’ Cup, which they won again in 1998. They went on to win their first UEFA Champions League title in 2012 and repeated the feat in 2021. Chelsea have won the UEFA Europa League twice, in 2013 and 2019. After winning the UEFA Conference League in 2025, Chelsea became the first club to win all four main UEFA competitions. They also won the FIFA Club World Cup in 2021 and 2025, the latter being the contest's first iteration with 32 teams.
Chelsea have rivalries with fellow London teams Arsenal, Tottenham Hotspur, Fulham, and also with Leeds United.