Associazione Calcio Milan commonly referred to as A.C. Milan or simply Milan is a professional football club in Milan, Italy, founded in 1899.
The club has spent its entire history, with the exception of the 1980–81 and 1982–83 seasons, in the top flight of Italian football, known as Serie A since 1929–30.
A.C. Milan's 18 FIFA and UEFA trophies are the fourth highest out of any club (joint with Boca Juniors), and the most out of any Italian club.
Milan has won a joint-record three Intercontinental Cups and one FIFA Club World Cup, seven European Cup/Champions League titles (Italian record), the UEFA Super Cup a joint-record five times and the Cup Winners' Cup twice. With 18 league titles, Milan is also the joint-second most successful club in Serie A, along with local rivals Internazionale and behind Juventus (35 league titles). They have also won the Coppa Italia five times, and the Supercoppa Italiana seven.
Milan's home games are played at San Siro, also known as the Stadio Giuseppe Meazza. The stadium, which is shared with city rivals Internazionale, is the largest in Italian football, with a total capacity of 80,018. Inter are considered their biggest rivals, and matches between the two teams are called Derby della Madonnina, which is one of the most followed derbies in football.
The club is one of the wealthiest in Italian and world football. It was a founding member of the now-defunct G-14 group of Europe's leading football clubs as well as its replacement, the European Club Association.
Milan is one of the best-supported football clubs in Italy, according to research conducted by Italian newspaper La Repubblica. Historically, Milan was supported by the city's working class. On the other hand, crosstown rivals Internazionale were mainly supported by the more prosperous middle class. The oldest ultras groups in all of Italian football, Fossa dei Leoni, originated in Milan. Currently, the main ultras group within the support base is Brigate Rossonere. Milan ultras have never had any particular political preference, but the media traditionally associated them with the left-wing until recently, when Berlusconi's presidency somewhat altered that view.
According to a study from 2010, Milan is the most supported Italian team in Europe and seventh overall, with over 18.4 million fans.
It had the ninth highest average attendance of European football clubs during the 2010–11 season, behind Borussia Dortmund, Barcelona, Manchester United, Real Madrid, Bayern Munich, Schalke 04, Arsenal and Hamburger SV.
Genoa fans consider Milan a hated rival after Genoa fan Vincenzo Spagnolo was stabbed to death by a Milan supporter in January 1995. Milan's main rivalry, however, is with its neighbor club, Internazionale, where both clubs meet in the widely anticipated Derby Della Madonnina twice every Serie A season. The name of the derby refers to the Blessed Virgin Mary, whose statue atop the Milan Cathedral is one of the city's main attractions. The match usually creates a lively atmosphere, with numerous (often humorous or offensive) banners unfolded before the start of the game. Flares are commonly present and contribute to the spectacle but they have occasionally led to problems, including the abandonment of the second leg of the 2004–05 Champions League quarter-final match between Milan and Inter on 12 April 2005, after a flare thrown from the crowd by an Inter supporter struck Milan goalkeeper Dida on the shoulder.
The rivalry with Juventus F.C. is a rivalry between the two most titled teams in Italy. The challenge confronts also two of the clubs with a greater basin of supporters as well as those with the greatest turnover and stock market value in the country. The match-ups between Milan and Juventus are regarded as the championship of Serie A, and both teams were often fighting for the top positions of the standings, sometimes even decisive for the award of the title. Milan also has rivalries with Roma and Napoli.