NASCAR on NBC is the branding used for broadcasts of NASCAR races that are produced by NBC Sports, and televised on several NBCUniversal-owned television networks, including the NBC broadcast network in the United States. The network originally aired races, typically during the second half of the season, from 1999 to 2006.

NBC Sports is an American programming division of the broadcast network NBC, owned and operated by the NBC Sports Group division of NBCUniversal and subsidiary of Comcast. The division is responsible for sports broadcasts on the network, and its dedicated national sports cable channels. Formerly operating as "a service of NBC News", it broadcasts a diverse array of sports events, including the French Open, the Premier League, the IndyCar Series, NASCAR, the National Football League (NFL), Notre Dame Fighting Irish college football, the Olympic Games, professional golf, the Tour de France and Thoroughbred racing, among others. Other programming from outside producers – such as coverage of the Ironman Triathlon – is also presented on the network through NBC Sports. With Comcast's acquisition of NBCUniversal in 2011, its own cable sports networks were aligned with NBC Sports into a part of the division known as the NBC Sports Group.