The 1955 Le Mans disaster was a major crash that occurred on 11 June 1955 during the 24 Hours of Le Mans motor race at Circuit de la Sarthe in Le Mans, Sarthe, France. Large pieces of debris flew into the crowd, killing 83 spectators and French driver Pierre Levegh, and injuring around 120 more. It was the most catastrophic crash in motorsport history, prompting Switzerland to institute a nation-wide ban on motorsports altogether that lasted until 2022.

The 1955 24 Hours of Le Mans was the 23rd 24 Hours of Le Mans and took place on 11 and 12 June 1955 on Circuit de la Sarthe. It was also the fourth round of the F.I.A. World Sports Car Championship. During the race, a crash killed driver Pierre Levegh and 83 spectators while injuring 120 others in the deadliest accident in motor racing history.