The 2008–09 Persian Gulf Cup was the 26th season of Iran's Football League and eighth season of Iran Pro League since its establishment in 2001. Persepolis were the defending champions. The season featured 15 teams from the 2007–08 Persian Gulf Cup and two new teams promoted from the 2007–08 Azadegan League: Payam Mashhad as champions and Foolad. Damash replaced Pegah. The league started on 4 August 2008 and ended on 26 April 2009. Esteghlal won the Pro League title for the second time in their history.

The Persian Gulf Pro League, formerly known as the Iran Premier League, is the highest division of professional football in Iran. Each year, its top team becomes the Iranian football champion, and the two lowest finishers are relegated to Azadegan League.