The 2011–12 Saudi Professional League (known as the Zain Professional League for sponsorship reasons) was the 36th season of the Saudi Professional League, the top Saudi professional league for association football clubs, since its establishment in 1976. The season began on 9 September 2011, and ended on 18 April 2012. Al-Hilal were the defending champions. The league was contested by the 12 teams from the 2010–11 season as well as Al-Ansar and Hajer, who joined as the promoted clubs from the 2010–11 First Division. They replace Al-Hazem and Al-Wehda who were relegated to the 2011–12 First Division.