FK Sloga 33 (Serbian Cyrillic: ФК Слога 33) is a football club based in Petrovac, Serbia.

The club took part in the 1951 Yugoslav Cup, defeating Radnički Beograd 4–1 in the opening round.

They met Partizan in the next phase and were defeated 15–0,[1] as Stjepan Bobek scored eight goals for the Belgrade side.

They would finish as champions in the 2012–13 season to earn promotion to the Serbian First League, reaching the second tier for the first time in their history.

[4] In the summer of 2016, the club was reformed and started off in the Braničevo District League, the fifth tier of Serbian football.