Fudbalski klub Partizan, commonly referred to as Partizan Belgrade outside of Serbia, or simply as Partizan, is a Serbian professional football club based in Belgrade. It forms a major part of the Partizan multi-sport club. The club plays in the Serbian SuperLiga and has spent its entire history in the top tier of Yugoslav and Serbian football having won a total of 45 official trophies: 27 national championships, 16 national cups, 1 national supercup, 1 Mitropa Cup finishing in the Yugoslav league all-time table as second.
Partizan was founded by young high officers of the Yugoslav People's Army in 1945 in Belgrade, as part of the Yugoslav Sports Association Partizan. Their home ground is the Partizan Stadium in Belgrade, where they have played since 1949. Partizan holds records such as playing in the first European Champions Cup match on 4 September, 1955, as well as becoming the first Balkan and Eastern European football club to reach the European Champions Cup final, when it did so in 1966. Partizan was the first Serbian club to compete in the group stage of the UEFA Champions League.
The club has a long-standing rivalry with Red Star Belgrade.