The 1981 24 Hours of Le Mans was the 49th Grand Prix of Endurance, and took place on 13 and 14 June 1981. It was also the eighth round of the World Endurance Championship of Drivers, and the fifth round of the World Championship for Makes.

The 1981 World Sportscar Championship season was the 29th season of FIA World Sportscar Championship motor racing. It featured the 1981 FIA World Endurance Championship which was contested over a fifteen race series which ran from 31 January to 27 September. The former World Challenge for Endurance Drivers was renamed to the World Endurance Championship of Drivers for 1981 and the World Championship of Makes was renamed to the World Endurance Championship of Makes. Bob Garretson won the World Endurance Championship of Drivers and Lancia was awarded the World Endurance Championship of Makes.