Chelsea Football Club, founded in 1905 by Gus Mears in Fulham, London, is a prominent English football club playing its home games at Stamford Bridge. They achieved their first major domestic trophy, the First Division championship, in 1955, and have since amassed six top-flight league titles, eight FA Cups, and five League Cups, ranking as the fifth-most successful club in English football.

On the international stage, Chelsea tasted European success with the Cup Winners' Cup in 1971 and went on to win the prestigious UEFA Champions League twice, in 2012 and 2021. The club notably became the first to win all four main UEFA competitions, a milestone achieved with their UEFA Conference League victory in 2025, complemented by two FIFA Club World Cup triumphs in 2021 and 2025. Chelsea maintains strong rivalries with fellow London clubs Arsenal and Tottenham Hotspur, as well as Leeds United.