Chelsea Football Club, also known as The Blues, Chelsea Blues or previously as The Pensioners, were founded in 1905 as one of the most famous English Premier League soccer teams. The clubs home ground is the 42,360 capacity Stamford Bridge soccer ground in Fulham, south-west London. Despite their name, the club is based just outside the Royal Borough of Kensington and Chelsea, in the London Borough of Hammersmith and Fulham. It is on the Fulham Road, which runs between Fulham and Chelsea. The club have won three league titles, three FA Cups, three League Cups and two UEFA Cup Winners Cups.

Unusual for a soccer club, Chelsea Football Club have only ever had one home ground, Stamford Bridge, where they have played since foundation, though it has gone through major changes through the years. 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 1/5th of the stand. It eventually became known as the "Shed end", the home of Chelseas most loyal and vocal supporters, though the origins of the name are unclear.

2005 was the Chelsea Football Clubs 100th Birthday. Led by captain John Terry and high-scoring midfielder Frank Lampard, they celebrated it in style by becoming Premiership champions in a record-breaking season (most clean sheets, fewest goals conceded, most victories, most points earned), League Cup winners with a 3–2 win over Liverpool at the Millennium Stadium and reaching the Champions League semi-finals. The following year, they were again League Champions, equalling their own Premiership record of 29 wins set the previous season. They also became the fifth team to win back-to-back championships since the Second World War and the only London club to do so since the 1930s.