The Le Mans Series (LMS) is a European sports car racing endurance series based around the 24 Hours of Le Mans race and run by the Automobile Club de l'Ouest (ACO). The series was originally named the Le Mans Endurance Series, but changed its name prior to the 2006 season.

It is similar to the American Le Mans Series (ALMS) based in the United States and Canada that has been running with ACO backing since 1999, but is run by IMSA. It is also seen as a rebirth of the European Le Mans Series (ELMS) which was created by IMSA and the ACO, but only ran in 2001. LMS champions and runners up in all four categories receive an automatic entry to the following year's Le Mans 24 Hour Race.