The 4 Hours of Castellet is a Blancpain Endurance Series sports car race held at Circuit Paul Ricard in Le Castellet, France. The race began in 1970 as a round of the European 2-Litre Sportscar Championship, and World Sportscar Championship rounds were held in 1974 and 1977. The race was a French national championship race in the 1980s. It was revived in 1998 by the International Sports Racing Series and again in 2010 by the Le Mans Series as an 8-hour race. In 2015, the event returned to its 1000 km format making it only the second time to use that distance since 1974.

Depending on the class-type and the year run, the race has been run as a 2 hour, 2.5 hour, 3 hour, 4 hour, 6 hour or 8 hour event, or as a 200 mile, 225 km, 500 km or 1,000 km event – as shown in the race results in the tables below.