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