2011–12 Iran 2nd Division season is the edition of third tier of the Iranian football league system's 2nd Division annual football competitive season for the Persian Gulf Cup.
In each group, the top two teams are promoted to Azadegan League, and bottom two teams are relegated to 3rd Division plus the relegation playoff loser.
In total, the league promotes 4 teams to Azadegan League and relegates 5 teams to 3rd Division.
The football league competition started on 8 September 2011.
The loser will be relegated to 2012–13 Iran Football's 3rd Division