| Competition: | Algerian Championnat National 2 |
| Season: | 2004–05 |
| Winners: | US Biskra |
| Promoted: | US Biskra Paradou AC CA Batna |
| Relegated: | ES Mostaganem USM Bel-Abbès HB Chelghoum Laïd |
| Matches: | 612 |
| Total Goals: | 686 |
| Prevseason: | 2003–04 |
| Nextseason: | 2005–06 |
The Algerian Championnat National 2 season 2004–05 is the thirteenth season of the league under its current title and fifteenth season under its current league division format. It started on 16 August 2004.
A total of 18 teams contested the division, including 12 sides remaining in the division from the previous season and three relegated from the Algerian Championnat National, and another three promoted from the Inter-Régions Ligue.