Fudbalski klub Crvena zvezda, commonly known in English as Red Star Belgrade or simply Red Star, is a Serbian professional football club based in Belgrade, the major part of the Red Star multi-sport club. Since FIFA's 2017 recognition of Intercontinental Cup as World titles, they hold the distinction of the only Eastern European or Socialist World Champions in football, having won the Intercontinental Cup, in 1991. They are the only Serbian and ex-Yugoslav club to have won the European Cup, also in 1991. With 27 national championships and 24 national cups between Serbian and the former Yugoslav competitions, Red Star was the most successful club in former Yugoslavia and finished first in the Yugoslav First League all-time table, and is the most successful club in Serbia. However, since the 1991–92 season, Red Star's best results are in the UEFA Europa League knockout stage.
According to 2008 polls, Red Star Belgrade is the most popular football club in Serbia, with 48.2% of the population supporting them. They have many supporters in all other former Yugoslavian republics and in the Serbian diaspora. Their main rivals are fellow Belgrade side Partizan.
Rajko Mitić Stadium