The 86th 24 Hours of Le Mans was an 24-hour automobile endurance race for Le Mans Prototype and Le Mans Grand Touring Endurance cars entered by teams of three drivers each held from 16 to 17 June 2018 at the Circuit de la Sarthe, close to Le Mans, France. It was the 86th running of the event, as organised by the automotive group, the Automobile Club de l'Ouest (ACO), since 1923. The race was the second round of the 2018–19 FIA World Endurance Championship, with 36 of the race's 60 entries contesting the series. Approximately 256,900 people attended the race. A test day was held two weeks prior to the race on 3 June.

The Circuit des 24 Heures du Mans, also known as Circuit de la Sarthe located in Le Mans, Sarthe, France, is a semi-permanent motorsport race course, chiefly known as the venue for the 24 Hours of Le Mans auto race. Comprising private, race-specific sections of track in addition to public roads which remain accessible most of the year, its present configuration is 13.626 km (8.467 mi) long, making it one of the longest circuits in the world. The capacity of the race stadium, where the short Bugatti Circuit is situated, is 100,000. The Musée des 24 Heures du Mans is a motorsport museum located at the main entrance of the venue.