The 1934 24 Hours of Le Mans was the 12th Grand Prix of Endurance. It took place at the Circuit de la Sarthe on 16 and 17 June 1934. Four privateer Alfa Romeo entries were expected to fight for outright honours, with an outside chance for the four Bugattis ranged against them. British cars dominated the smaller classes. Two-time winner Raymond Sommer soon took the lead until, after only 90 minutes, he stopped out on the circuit with smoke pouring from his engine. For the next five hours the Alfas of Luigi Chinetti and Earl Howe duelled for the lead. However, soon after night fell, the lights failed on Howe's Alfa costing him two hours to get the electrics repaired. Chinetti took the lead, but their car had developed a leak in the fuel tank. The solution was the same as Sommer had used the previous year: to plug the gap with chewing-gum.

Pierre Raymond Sommer was a French racing driver. He raced both before and after WWII with some success, particularly in endurance racing. He won the 24 Hours of Le Mans endurance race in both 1932 and 1933, and although he did not reach the finishing line in any subsequent appearance at the Le Mans, he did lead each event until 1938. Sommer was also competitive at the highest level in Grand Prix motor racing, but did not win a race. He won the French Grand Prix in 1936, but the event that year was run as a sports car race.