Chelsea Football Club are a professional football club based in Fulham, London, who play in the Premier League, the highest level of English football. Founded in 1905, the club have spent most of their history in the top tier of English football. The club's home ground is the 41,837-seat Stamford Bridge stadium, where they have played since their establishment. Chelsea had their first major success in 1955, winning the league championship, and won various cup competitions during the 1960s, 1970s, 1990s and 2000s. The club have enjoyed their greatest period of success in the past two decades, winning 15 major trophies since 1997. Domestically, Chelsea have won four league titles, seven FA Cups, four League Cups and four FA Community Shields, while in continental competitions they have won two UEFA Cup Winners' Cups, one UEFA Super Cup, one UEFA Europa League and one UEFA Champions League. 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. 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 sustained the fifth highest average all-time attendance in English football. Their average home gate for the 2012–13 season was 41,462, the sixth highest in the Premier League. Since July 2003, Chelsea have been owned by Russian billionaire Roman Abramovich. In April 2013 they were ranked by Forbes Magazine as the seventh most valuable football club in the world, at £588 million ($901 million), an increase of 18% from the previous year.

Stamford Bridge (/ˈstæm.fərd ˈbrɪdʒ/) is a football stadium located in Fulham, London. It is the home ground of Chelsea F.C.. The stadium is located within the Moore Park Estate also known as Walham Green and is often referred to as simply The Bridge. The capacity is 41,798, making it the eighth largest ground in the Premier League. Opened in 1877, the stadium was used by the London Athletic Club until 1905, when new owner Gus Mears founded Chelsea Football Club to occupy the ground; Chelsea have played their home games there ever since. It has undergone numerous major changes over the years, most recently in the 1990s when it was renovated into a modern, all-seater stadium. Stamford Bridge has been used as a venue for England international matches, FA Cup Finals, FA Cup semi-finals and Charity Shield games. It has also hosted numerous other sports, such as cricket, rugby union, speedway, greyhound racing, baseball and American football. The stadium's highest official attendance is 82,905, for a league match between Chelsea and Arsenal on 12 October 1935.