| Competition: | Slovenian Second League |
| Season: | 2004–05 |
| Winners: | Rudar Velenje |
| League Topscorer: | Mirnes Ibrahimovič (32 goals) |
| Matches: | 198 |
| Total Goals: | 604 |
| Prevseason: | 2003–04 |
| Nextseason: | 2005–06 |
The 2004–05 Slovenian Second League season started on 8 August 2004 and ended on 5 June 2005. Each team played a total of 33 matches.