The Second League of Serbia and Montenegro was the second tier of the football league system in Serbia and Montenegro, one level below the First League of Serbia and Montenegro.
Formed in 1992 after the breakup of Yugoslavia, it consisted of a single league for the first four seasons of its formation before splitting into regional leagues in 1996.
After the first half of the season, when all teams have played each other twice in their respective group, the bottom four teams of the IIA group are replaced with the top four teams of IIB for the second half of the season.
At the end of the season, performance-based bonus points are applied and the standings from both groups are collated to determine the champions, promotion and relegation, and which group the remaining teams will start next season in.
The two-group format was scrapped in 1996 and the division was split geographically into parallel leagues, starting with Eastern and Western sections until 1999.