The 1998–99 Algerian Championnat National was the 37th season of the Algerian Championnat National since its establishment in 1962.
A total of 28 teams contested the league, with USM El Harrach as the defending champions, The Championnat started on September 10, 1998. and ended on May 31, 1999.
Teams promoted from Algerian Division 2 1998-1999 Teams relegated to Algerian Division 2 1999-2000 Teams relegated to Algerian Division 3 1999-2000