The 2009 International GT Open season was the fourth season of the International GT Open. The season began on April 18 and ended on November 8, 2009. Joël Camathias and Marcel Fässler claimed both the Super GT title and the overall title, beating Autorlando Sport's Richard Lietz and Gianluca Roda in both standings. GTS champions were the Kessel Racing pairing of Michał Broniszewski and Philipp Peter.