| Competition: | Algerian Championnat National |
| Season: | 2004–05 |
| Winners: | USM Alger |
| Relegated: | OMR El Annasser GC Mascara US Chaouia |
| League Topscorer: | Hamid Berguiga (18 goals) |
| Biggest Home Win: | WA Tlemcen 8–1 MC Alger |
| Biggest Away Win: | MC Alger 1–4 CS Constantine CR Belouizdad 0–3 USM Alger CR Belouizdad 0–3 NA Hussein Dey MC Oran 0–3 OMR El Annasser US Chaouia 0–3 ES Sétif |
| Highest Scoring: | WA Tlemcen 8–1 MC Alger |
| Matches: | 240 |
| Total Goals: | 542 |
| Prevseason: | 2003–04 |
| Nextseason: | 2005–06 |
The 2004–05 Algerian Championnat National was the 43rd season of the Algerian Championnat National since its establishment in 1962. A total of 16 teams contested the league, with JS Kabylie as the defending champions, The Championnat started on August 20, 2004. and ended on June 13, 2005.
Teams promoted from Algerian Division 2 2004–2005
Teams relegated to Algerian Division 2 2005–2006
| Rank | Scorer | Club | Goals | |
|---|---|---|---|---|
| 1 | Hamid Berguiga | JS Kabylie | 18 | |
| 2 | Billel Dziri | USM Alger | 11 | |
| 3 | Noureddine Daham | MC Alger | 11 | |
| 4 | Nabil Hemani | OMR El Annasser | 11 | |
| 5 | Adel El Hadi | USM Annaba | 10 | |
| 6 | Sofiane Daoud | MC Oran | 10 | |
| 7 | Hocine Fenier | CS Constantine | 10 | |
| 8 |  Stéphane Nankop | CA Bordj Bou Arreridj | 10 | |
| 9 | Samir Alliche | NA Hussein Dey | 10 | |
| 10 | Farid Touil | USM Blida | 9 | |
| 11 | Karim Braham Chaouch | MC Alger | 9 | |
| 12 | Yacine Boulaïncer | WA Tlemcen | 8 | |
| 13 | El Yacine Derradj | ES Sétif | 8 | |
| 14 | Michael Eneramo | USM Alger | 7 | |
| 15 | Hamza Yacef | NA Hussein Dey | 7 | |
| 16 | Redouane Benzerga | MC Oran | 7 |