The 2009 Supersport World Championship was the eleventh FIM Supersport World Championship season—the thirteenth taking into account the two held under the name of Supersport World Series. The season started on 1 March at Phillip Island and finished on 25 October at Portimão after 14 rounds. The championship supported the Superbike World Championship at every round. Despite a win at the final round for Eugene Laverty, a fourth-place finish by Cal Crutchlow won him the championship by seven points over the Irish rider.