Sports car racing is a form of motorsport road racing that uses sports cars with two seats and enclosed wheels. The cars in question may be either purpose-built sports prototypes, which are the highest level in sports car racing; or grand tourers (GT cars) based on road-going models and therefore more common, but not as fast. Sports car races are often endurance races run over particularly long distances or large amounts of time (generally between 6 and 24 hours), resulting in an emphasis on reliability and efficiency of the car and its drivers over outright car performance or driver skills. The FIA World Endurance Championship and IMSA SportsCar Championship are some of the best-known sports car racing series. Sports car racing is one of the main types of circuit auto racing, alongside open-wheel racing (such as Formula One and Indycar), touring car racing (such as BTCC, which is based on 'saloon cars' as opposed to the 'exotics' seen in sports cars) and stock car racing (such as NASCAR).

A hybrid of the purism of open-wheelers and the familiarity of touring car racing, sports car racing is commonly associated with the annual 24 Hours of Le Mans endurance race. First run in 1923, Le Mans is one of the longest-running motor races. Well-known defunct sports car races include the Italian classics, the Targa Florio (1906–1977) and Mille Miglia (1927–1957), and the Mexican Carrera Panamericana (1950–1954). Most top-class sports car races focus more on endurance and strategy than pure speed or skills, and longer races usually involve complex pit strategies and regular driver changes. As a result, sports car racing is seen more as a team endeavour than an individual sport, with team managers such as John Wyer, Tom Walkinshaw, driver-turned-constructor Henri Pescarolo, Peter Sauber and Reinhold Joest becoming almost as famous as some of their drivers.

Success in sports car racing helped build the prestige of Alfa Romeo, Aston Martin, Audi, Bentley, BMW, Chevrolet, Ferrari, Jaguar, Lamborghini, Lancia, Lotus, Maserati, Mercedes-Benz, and Porsche. These makers' top road cars have often been similar in engineering and styling to those raced. This close association with the exotic nature of the cars distinguishes between sports car racing and touring cars.

The 24 Hours of Daytona, 12 Hours of Sebring, and 24 Hours of Le Mans are considered the Triple Crown of endurance racing. Other crown-jewel sports car endurance races include Petit Le Mans, Nürburgring 24 Hours, Spa 24 Hours, Bathurst 12 Hour and Suzuka 1000km.

According to historian Richard Hough, "It is obviously impossible to distinguish between the designers of sports cars and Grand Prix machines during the pre-1914 period. The late Georges Faroux contended that sports-car racing was not born until the first 24 Hours of Le Mans race in 1923, and while as a joint-creator of that race he may have been prejudiced in his opinion, it is certainly true that sports-car racing as it was known after 1919 did not exist before the First World War."

In the 1920s, the cars used in endurance racing and Grand Prix were still basically identical, with fenders and two seats, to carry a mechanic if necessary or permitted. Cars such as the Bugatti Type 35 were almost equally at home in Grands Prix and endurance events, but specialisation gradually started to differentiate the sports-racer from the Grand Prix car. The legendary Alfa Romeo Tipo A Monoposto started the evolution of the true single-seater in the early 1930s; the Grand Prix racer and its miniature voiturette offspring rapidly evolved into high performance single seaters optimised for relatively short races, by dropping fenders and the second seat. During the later 1930s, French constructors, unable to keep up with the progress of the Mercedes-Benz and Auto-Union cars in GP racing, withdrew into primarily domestic competition with large-capacity sports cars – marques such as Delahaye, Talbot and the later Bugattis were locally prominent.

Similarly, through the 1920s and 1930s the road-going sports/GT car started to emerge as distinct from fast tourers (Le Mans had originally been a race for touring cars) and sports cars, whether descended from primarily road-going vehicles or developed from pure-bred racing cars came to dominate races such as Le Mans and the Mille Miglia.

In open-road endurance races across Europe such as the Mille Miglia, Tour de France and Targa Florio, which were often run on dusty roads, the need for fenders and a mechanic or navigator was still there. As mainly Italian cars and races defined the genre, the category came to be known as Gran Turismo (particularly in the 1950s), as long distances had to be travelled, rather than running around on short circuits only. Reliability and some basic comfort were necessary in order to endure the task.