National Association for Stock Car Auto Racing (NASCAR) Adalah badan menyetujui yang paling besar motorsports di Amerika Serikat. Tiga paling besar membalap rentetan disetujui oleh NASCAR adalah NEXTEL Cup, Busch Series dan Rentetan Truk Tukang. Juga mengawasi NASCAR Regional Racing, Whelen Modified Tour, dan Whelen All-American Series. NASCAR menyetujui di atas 1.500 perlombaan di di atas 100 jalan setapak di 39 negara bagian, Kanada, dan Meksiko. Dari 1996 sampai 1998, NASCAR mengadakan perlombaan pameran di Jepang, dan perlombaan pameran di Australia pada 1988.

Dengan akar sedaerah hiburan di AS Tenggara, NASCAR sudah bertambah besar untuk menjadi detik-kebanyakan olahraga profesional yang populer di syarat-syarat peringkat televisi di dalam AS, menggolongkan di belakang hanya Liga Football Nasional.

Secara internasional, NASCAR membalap ialah melakukan siaran di di atas 150 negara. Memegang 17 di antara 20 yang teratas yang dihadiri yang memakai peristiwa di AS, dan mempunyai 75 juta orang penggemar yang membeli di atas $3 milyar dalam bentuk penjualan produk berlisensi yang tahunan. Penggemar ini dianggap sebagai yang macam-setia di sama sekali olahraga dan akibatnya, Kekayaan 500 perusahaan mensponsori NASCAR lebih dari olahraga lain yang mana pun.

NASCAR's headquarters are located in Daytona Beach, Florida, although it also maintains offices in four North Carolina cities: Charlotte, Mooresville, Concord, and Conover. Regional offices are also located in New York City, Los Angeles, Arkansas, and international offices in Mexico City and Toronto, Ontario.

In the first few decades of the 1900s, Daytona Beach became known as the place to set world land speed records. The beach became a mecca for racing enthusiasts and fifteen records were set on this beach between 1905 and 1935. Then, in 1936, the Bonneville Salt Flats became the premier place to host land speed record attempts, so the Daytona beach course began hosting car racing events. Drivers raced a 1.5 to 2 mile stretch of beach as one straightaway and beachfront highway A1A as the other.

NASCAR races take place predominantly on oval tracks of 3 or 4 turns, with all turns to the left. Oval tracks are classified as short track (less than 1 mile), intermediate or speedway (1 to 2 miles) or superspeedway (2.5 mile tri-oval). Road courses are any tracks having both left and right turns. As of 2007, the NEXTEL Cup series includes 36 points races, comprised of 34 oval-track races and 2 road course races.

NASCAR races are different compared to the rough terrain and sharp turns of Rally, as well as the complicated twists and turns seen in the Formula One course that put up to 5 or 6 g's of stress on the driver's body. NASCAR is not the only racing league to run a large number of races on oval tracks; the Indy Racing League also runs many oval track races, although IndyCars usually average over 30-40 miles an hour faster than NEXTEL Cup cars due to lighter cars, high downforce designs, and wider tires.

NEXTEL Cup races have 43 cars in competition at the start of each race, compared to 22 for Formula One and 18-20 for IndyCar Series and Champ Car World Series. NASCAR teams must endure a 36-race schedule over 41 weeks. Teams usually only have about five days to prepare before arriving at any given track.

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