Chelsea Football Club is a professional football club in London, England, that competes in the Premier League. Founded in 1905, the club's home ground since then has been Stamford Bridge.

Chelsea won the First Division title in 1955, followed by various cup competitions between 1965 and 1971. The past two decades have seen sustained success, with the club winning 21 trophies since 1997. In total, the club has won 27 major trophies; six 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'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, and for the 2016-17 season at 41,507. Since 2003, Chelsea have been owned by Russian billionaire Roman Abramovich. In 2017, they were ranked by Forbes magazine as the seventh most valuable football club in the world, at £1.40 billion ($1.85 billion) and in the 2016-17 season it was the eighth highest-earning football club in the world, earned EUR428 million.

In 1904, Gus Mears acquired the Stamford Bridge athletics stadium with the aim of turning it into a football ground. An offer to lease it to nearby Fulham was turned down, so Mears opted to found his own club to use the stadium. As there was already a team named Fulham in the borough, the name of the adjacent borough of Chelsea was chosen for the new club; names like Kensington FC, Stamford Bridge FC and London FC were also considered. Chelsea were founded on 10 March 1905 at The Rising Sun pub (now The Butcher's Hook), opposite the present-day main entrance to the ground on Fulham Road, and were elected to the Football League shortly afterwards.

The club won promotion to the First Division in their second season, and yo-yoed between the First and Second Divisions in their early years. They reached the 1915 FA Cup Final, where they lost to Sheffield United at Old Trafford, and finished third in the First Division in 1920, the club's best league campaign to that point. Chelsea attracted large crowds and had a reputation for signing big-name players, but success continued to elude the club in the inter-war years.

Former Arsenal and England centre-forward Ted Drake became manager in 1952 and proceeded to modernise the club. He removed the club's Chelsea pensioner crest, improved the youth set-up and training regime, rebuilt the side with shrewd signings from the lower divisions and amateur leagues, and led Chelsea to their first major trophy success - the League championship - in 1954-55. The following season saw UEFA create the European Champions' Cup, but after objections from The Football League and the FA Chelsea were persuaded to withdraw from the competition before it started. Chelsea failed to build on this success, and spent the remainder of the 1950s in mid-table. Drake was dismissed in 1961 and replaced by player-coach Tommy Docherty.

Chelsea have only had one home ground, Stamford Bridge, where they have played since the team's foundation. It was officially opened on 28 April 1877 and for the first 28 years of its existence it was used almost exclusively by the London Athletic Club as an arena for athletics meetings and not at all for football. In 1904 the ground was acquired by businessman Gus Mears and his brother Joseph, who had also purchased nearby land (formerly a large market garden) with the aim of staging football matches on the now 12.5 acre (51,000 m²) site. Stamford Bridge was designed for the Mears family by the noted football architect Archibald Leitch, who had also designed Ibrox, Craven Cottage and Hampden Park. Most football clubs were founded first, and then sought grounds in which to play, but Chelsea were founded for Stamford Bridge.

Starting with an open bowl-like design and one covered terrace, Stamford Bridge had an original capacity of around 100,000. The early 1930s saw the construction of a terrace on the southern part of the ground with a roof that covered around one fifth of the stand. It eventually became known as the "Shed End", the home of Chelsea's most loyal and vocal supporters, particularly during the 1960s, 70s and 80s. The exact origins of the name are unclear, but the fact that the roof looked like a corrugated iron shed roof played a part.

In the early 1970s, the club's owners announced a modernisation of Stamford Bridge with plans for a state-of-the-art 50,000 all-seater stadium. Work began on the East Stand in 1972 but the project was beset with problems and was never completed; the cost brought the club close to bankruptcy, culminating in the freehold being sold to property developers. Following a long legal battle, it was not until the mid-1990s that Chelsea's future at the stadium was secured and renovation work resumed. The north, west and southern parts of the ground were converted into all-seater stands and moved closer to the pitch, a process completed by 2001.

When Stamford Bridge was redeveloped in the Bates era many additional features were added to the complex including two hotels, apartments, bars, restaurants, the Chelsea Megastore, and an interactive visitor attraction called Chelsea World of Sport. The intention was that these facilities would provide extra revenue to support the football side of the business, but they were less successful than hoped and before the Abramovich takeover in 2003 the debt taken on to finance them was a major burden on the club. Soon after the takeover a decision was taken to drop the "Chelsea Village" brand and refocus on Chelsea as a football club. However, the stadium is sometimes still referred to as part of "Chelsea Village" or "The Village".

Chelsea are among the most widely supported football clubs in the world. They have the sixth highest average all-time attendance in English football and regularly attract over 40,000 fans to Stamford Bridge; they were the seventh best-supported Premier League team in the 2013-14 season, with an average gate of 41,572. Chelsea's traditional fanbase comes from all over the Greater London area including working-class parts such as Hammersmith and Battersea, wealthier areas like Chelsea and Kensington, and from the home counties. There are also numerous official supporters clubs in the United Kingdom and all over the world. Between 2007 and 2012, Chelsea were ranked fourth worldwide in annual replica kit sales, with an average of 910,000. Chelsea's official Twitter account has 9.8 million followers as of September 2017.

At matches, Chelsea fans sing chants such as "Carefree" (to the tune of "Lord of the Dance", whose lyrics were probably written by supporter Mick Greenaway), "Ten Men Went to Mow", "We All Follow the Chelsea" (to the tune of "Land of Hope and Glory"), "Zigga Zagga", and the celebratory "Celery", with the latter often resulting in fans ritually throwing celery. The vegetable was banned inside Stamford Bridge after an incident involving Arsenal midfielder Cesc Fàbregas at the 2007 League Cup Final.

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