The 2009 24 Hours of Le Mans was the 77th Grand Prix of Endurance, an endurance auto race run over 24 hours. It took place at the Circuit de la Sarthe, Le Mans, France, and was organised by the Automobile Club de l'Ouest (ACO) over 13–14 June 2009 and was started by Fiat and Ferrari chairman Luca Cordero di Montezemolo at 15:00 local time. A test day was initially scheduled for 31 May that year, but was canceled by the ACO due to economic concerns. The race was attended by 234,800 spectators.

The 24 Hours of Le Mans is an endurance-focused sports car race held annually near the town of Le Mans, France. It is widely considered to be one of the world's most prestigious races, and is one of the races—along with the Monaco Grand Prix and Indianapolis 500—that form the Triple Crown of Motorsport, and is also one of the races alongside the 24 Hours of Daytona and 12 Hours of Sebring that make up the informal Triple Crown of endurance racing. Run since 1923, it is the oldest active endurance racing event in the world.