The 1983 World Endurance Championship was the 31st season of FIA World Sportscar Championship auto racing series. It featured the two world championships and two cups for drivers and manufacturers which was contested by Group C Sports Cars, Group C Junior Sports Cars and Group B GT Cars in a seven race events which ran from 10 April to 10 December 1983. The World Endurance Championship for Drivers was won by Jacky Ickx while the World Endurance Championship for Manufacturers was won by Porsche. The Group C Junior Cup was won by Giannini Alba and the Grand Touring Cup by Porsche.

The World Sportscar Championship was the world series run for sports car racing by the FIA from 1953 to 1992. The championship evolved from a small collection of the most important sportscar, endurance, and road racing events in Europe and North America with dozens of gentleman drivers at the grid to a professional racing series where the world's largest automakers spent millions of dollars per year.