| Competition: | Ljubljana Subassociation League |
| Season: | 1930–31 |
| Winners: | I. SSK Maribor |
| Prevseason: | 1929–30 |
| Nextseason: | 1931–32 |
The 1930–31 Ljubljana Subassociation League was the 12th season of the Ljubljana Subassociation League. I. SSK Maribor won the league for the first time after defeating Svoboda with 13–2 on aggregate in the final.[1]