Association Sportive Olympique de Chlef (Arabic: الجمعية الرياضية أولمبي الشلف), known as ASO Chlef or simply ASO for short, is an Algerian football club based in Chlef, founded in 1947. The club colours are red and white. Their home stadium, Mohamed Boumezrag Stadium, has a capacity of some 20,000 spectators. The club is currently playing in the Algerian Ligue Professionnelle 1.