The Iraq Division One is the second-highest division of the Iraqi football league system after the Premier League. The league is contested by 24 clubs. It is operated by the Iraq Football Association (IFA). Each season, the two top-finishing teams in the Division One are automatically promoted to the Premier League. The four lowest-finishing teams in the Division One are relegated to Division Two. The number of clubs in the league have changed throughout history, most recently in the 2021–22 season when the number of clubs decreased from 28 to 24.