| Competition: | Ljubljana Subassociation League |
| Season: | 1928–29 |
| Winners: | Primorje |
| Prevseason: | 1927–28 |
| Nextseason: | 1929–30 |
The 1928–29 Ljubljana Subassociation League was the tenth season of the Ljubljana Subassociation League. Primorje defended the title after defeating I. SSK Maribor with 12–7 on aggregate in the final.[1]