Millwall FC is an English football team based in Bermondsey in the London Borough of Southwark, South East London. Known originally as Millwall Rovers the club was founded by the workers of J.T. Morton canning and preserve factory in Millwall in the East End of London on the Isle of Dogs in 1885. In April 1889, the club changed its name to Millwall Athletic, inspired by their move to their new home The Athletic Grounds. They would become 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. Millwall Athletic were also champions of the Western Football League in 1908 and 1909 before moving to a new stadium, named The Den in New Cross in 1910.  The club was invited to join the Football League in 1920, along with twenty-two other clubs as a result of  the creation of the new Football League Third Division.  They spent most of the pre-war years in the Third Division but in 1938 were promoted to the Second Division before the Second World War led to a suspension of football.  In 1948, Millwall were relegated back into Division Three (South) and ten years later, when the regional divisions were scrapped, the club found itself in Division Four where they spent much of the 1960s. The 1970s saw the club bounce between the second and third divisions. Fortunes changed in 1985 when Millwall were promoted back into the Second Division and in 1988 they won the Second Division championship to take their place in the First Division for the first time. After a creditable 10th place finish in 1989, Millwall were relegated in 1990. 

In May 1993 the club moved into a new 20,000 all seater stadium at Senegal Fields, christened the New Den. Under Mick McCarthy they regularly challenged for promotion but a year after his departure in 1995 Millwall were relegated to Division Two (the old Third Division). In January 1997 trading in Millwall's shares were suspended and the club went into administration. A rescue package was put in place and the club survived. Four year later, in 2001, Millwall returned to e Division One and narrowly missed out on promotion to the Premiership the following season, losing out in the play-offs. In October 2003 Dennis Wise and Ray Wilkins took charge and, after a remarkable run, Millwall reached their first ever FA Cup Final in May 2004, losing 0-3 to Manchester United at the Millennium Stadium. Once Wise and Wilkins moved on, success was hard to find and in 2006, the club was relegated from the Championship to League One (once the Third Division). Millwall celebrated their 125th Anniversary in 2010 in the Championship after winning the play-off final the previous season. After a number of near brushes with relegation they finished 22nd in the Championship and returned to League One in 2015. Milwall reached two successive Play-off Finals, winning the second 1-0 against Bradford City and securing a place back in the Championship in May 2018 where they have established themselves as one of the stronger clubs.