Endurance racing is a form of motorsport which is meant to test the durability of equipment and endurance of participants. Teams of multiple drivers attempt to cover a large distance in a single event, with participants given a break with the ability to change during the race. Endurance races can be run either to cover a set distance in laps as quickly as possible, or to cover as much distance as possible over a preset amount of time.

One of the more common lengths of endurance races has been running for 1,000 kilometres (620 mi), or roughly six hours. Longer races can run for 1,000 miles (1,600 km), 12 hours, or even 24 hours. Teams can consist of anywhere from two to four participants per event, which is dependent on the driver's endurance abilities, length of the race, or even the rules for each event.At club level racing, a race taking either 30 minutes or 1 hour could be considered as an endurance race.

In the beginning of formalised endurance racing, the races tended to be for Sports Cars while the Grand Prix cars of the era began to evolve into the Open wheel racing cars of today and ran over shorter distances. Over time Sports cars began to evolve away from their roots as a production based alternative to pure-bred racing machines of Grand Prix cars, which led to the creation of GT and Touring Car racing classes, and these classes continued to embrace the endurance format. Multiple drivers per car was an early adaptation as the rigors of endurance racing quickly overcome the abilities of most racing drivers to compete solo, although solo attempts on 24 hour races like Le Mans would continue into the 1950s.The various endurance formats were appealing to manufacturers, not only as alternatives to the expense of Grand Prix racing, but also because of its increased relevance to road going models.

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Tom

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