The 2011–12 Algerian Ligue Professionnelle 1 was the 50th season of the Algerian Ligue Professionnelle 1 since its establishment in 1962. A total of 16 teams contested the league, with ASO Chlef as the defending champions. The league started on 6 September 2011, and ended on 22 May 2012. While the league was originally scheduled to start on 10 September 2011, the official start date will be 6 September 2011, with a match between JS Kabylie and MC Alger. The tie was moved up due to the two club's participation in African competition.