Millwall Football Club () is a professional football club in Bermondsey, South East London, England. They compete in the EFL Championship, the second level of English football. Founded as Millwall Rovers in 1885, the club has retained its name despite having last played in the Millwall area of the Isle of Dogs in 1910. From then until 1993, the club played at what is now called The Old Den in New Cross, before moving to its current home stadium nearby, called The Den. The traditional club crest is a rampant lion, referred to in the team's nickname The Lions. Millwall's traditional kit consists of dark blue shirts, white shorts, and blue socks.
Millwall was one of the founding members of the Southern League in 1894. They competed in it for 22 seasons until 1920, claiming the title twice in 1895 and 1896. Since joining the Football League in the 1920–21 season, the club have been promoted 11 times (five times as champions in 1928, 1938, 1962, 1988, and 2001) and relegated nine times. They have spent 93 of their 100 seasons in the Football League yo-yoing between the second and third tiers. The club had a brief spell in the top flight between 1988 and 1990, in which they achieved their highest ever league finish of tenth place in the Football League First Division in 1988–89. Millwall reached the 2004 FA Cup Final and qualified for UEFA competitions for the first time in their history, playing in the UEFA Cup. The club have reached the Football League play-offs nine times, winning the League One play-off finals in 2010 and 2017. Millwall also won the Football League Group Cup in 1983, and were Football League Trophy finalists in 1999.
The club was founded as Millwall Rovers by the workers of J.T. Morton's canning and preserve factory in the Millwall area of the Isle of Dogs in London's East End in 1885. J.T. Morton was founded in Aberdeen in 1849 to supply sailing ships with food, the company opened their first English cannery and food processing plant at Millwall dock in 1872 and attracted a workforce from across the country, including the east coast of Scotland, primarily Dundee. The club secretary was 17-year-old Jasper Sexton, the son of the landlord of The Islander pub in Tooke Street where Millwall held their club meetings. Millwall Rovers' first game was an away fixture held on 3 October 1885 against Fillebrook, a team that played in Leytonstone. The newly formed team were beaten 5–0. Millwall's first home game was on a piece of waste ground on Glengall Road against St Luke's, on 24 October 1885, which they won 2–1.
Rovers found a better playing surface for the 1886–87 season, at the rear of the Lord Nelson pub and it became known as the Lord Nelson Ground. In November 1886, the East End Football Association was formed, along with the Senior Cup Competition. Millwall made it to the final against London Caledonians, which was played at Leyton Cricket Ground. The match finished 2–2 and the teams shared the cup for six months each. Millwall won the East London Senior Cup at the first attempt. The club also won the cup in the following two years, and the trophy became their property.
In April 1889, a resolution was passed for Millwall to drop "Rovers" from their name, and they began playing under the name Millwall Athletic, inspired by their move to their new home The Athletic Grounds. They were founding members of the Southern Football League which they won for the first two years of its existence, and were runners-up in its third. During this period the club was invited to join the Second Division of the Football League but the committee turned down the opportunity, partly due to the expected increase in travel expenses but also to stay loyal to the Southern League. They were forced to move to a new ground North Greenwich in 1901, as the Millwall Dock Company wanted to use their land as a timberyard. Millwall Athletic reached the semi-finals of the FA Cup in 1900 and 1903, and were also champions of the Western Football League in 1908 and 1909. On 10 October 1910, Millwall played their last game as an East London club against Woolwich Arsenal in the London Challenge Cup. Millwall won the game 1–0 in front of a crowd of 3000.
Millwall moved to a new stadium, named The Den, in New Cross, South East London in 1910. The club had previously occupied four different grounds in the 25 years since their formation in East London; limited expansion space on the Isle of Dogs meant The Lions had to move to boost support and attendances. The estimated cost of The Den was £10,000. The first match played at the new ground was on 22 October 1910 against reigning Southern League champions Brighton & Hove Albion, who won 1–0.
