| Founded | 2006 |
|---|---|
| First season | 2006–07 |
| Country | Serbia |
| Confederation | FIBA Europe |
| Divisions | 4 |
| Number of teams | 56 |
| Level on pyramid | 3rd |
| Promotion to | Second Men's League |
| Relegation to | Second Men's Regional League |
| Domestic cup(s) | Cup of Serbia |
| Website | kss.rs |
First Men's Regional League (Serbian Cyrillic: Прва мушка регионална лига, romanized: Prva muška regionalna liga), 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).