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The 1968 24 Hours of Le Mans was the 36th Grand Prix of Endurance, and took place on 28 and 29 September 1968 on the Circuit de la Sarthe, in Le Mans, France.
A significant change was the imposition of 5 L (305 cu in) engine limits on Group 4 racers, to lower overall track speeds. Originally scheduled for the weekend of 15 and 16 June, the race had to be delayed until September due to protests, strikes, and civil unrest in France during the spring of 1968. The rescheduled race increased the chances of the Group 6 Prototypes against the Group 4 Sports cars, as the new Prototype cars had matured during the season. It also increased the amount of darkness that drivers would be racing in compared to June, by about three hours: a total of 11 hours. Its new date made it the tenth and final round of the 1968 World Sportscar Championship of a tense and close championship between Ford and Porsche.
The winners were Pedro Rodriguez and Lucien Bianchi, in the J.W. Automotive Gulf-Oil Ford GT40. Despite Porsche finishing second and third, the victory was enough to give Ford the manufacturer's title.
There were also two major accidents during the race ending the racing careers of Willy Mairesse and Mauro Bianchi (Lucien's younger brother), who both suffered severe burns in the crashes.