First Regional Basketball League

First Men's Regional League (Прва мушка регионална лига), previously First Serbian League, is the men's regional basketball league in Serbia. It is the 3rd-tier of the basketball league system in Serbia. Founded in 2006, it is run by the Basketball Federation of Serbia (KSS).

Competition format
The league, operated by the Basketball Federation of Serbia and regional basketball associations, consists of four divisions, North, Central, East and West, which have 14 teams each. The first team in every division will be promoted to the Second Basketball League of Serbia. The teams positioned 13th and 14th in the First Regional League will be relegated to a lower-tier league - the Second Regional League.

History
Division champions of the First Regional League:

Current clubs
The following is the list of clubs for the 2022–23 season.

North
The North division is composed of 16 clubs.

Center
The Center division is composed of 14 clubs.

East
The East division is composed of 16 teams.

West
The West division is composed of 16 teams.