The 2009 Le Mans Series was the sixth season of Automobile Club de l'Ouest's Le Mans Series. It was contested over five events between 5 April and 13 September 2009.
Aston Martin Racing trio Jan Charouz, Tomáš Enge and Stefan Mücke finished every race on the podium en route to the LMP1 championship. In LMP2, the pro-amateur pairing of Olivier Pla and Miguel Amaral won the title, with two class wins. Yann Clairay and Patrice Goueslard shared the honours in GT1, driving for former skier Luc Alphand's team. In the tightest battle out of the classes, Marc Lieb and Richard Lietz took GT2 honours by a single point ahead of JMW Motorsport pairing Rob Bell and Gianmaria Bruni.