| Competition: | Slovenian Second League |
| Season: | 2009–10 |
| Winners: | Primorje |
| Promoted: | Primorje Triglav Kranj |
| Relegated: | Livar MU Šentjur |
| League Topscorer: | Darko Kremenovič (15 goals) |
| Matches: | 135 |
| Total Goals: | 373 |
| Prevseason: | 2008–09 |
| Nextseason: | 2010–11 |
The 2009–10 Slovenian Second League season started on 9 August 2009 and ended on 23 May 2010. Each team played a total of 27 matches.